Who was the last emperor of the Roman Empire?

The Western Roman Empire collapsed in the late 5th century. Romulus Augustulus is often considered to be the last emperor of the West after his forced abdication in 476, although Julius Nepos maintained a claim recognized by the Eastern Empire to the title until his death in 480. Following Nepos' death, the Eastern Emperor Zeno abolished the division of the position and proclaimed himself as the sole Emperor of a reunited Roman Empire. The Eastern imperial lineage continued to rule from Constantinople ("New Rome"); they continued to style themselves as Emperor of the Romans (later βασιλεύς Ῥωμαίων in Greek), but are often referred to in modern scholarship as Byzantine emperors. Constantine XI Palaiologos was the last Roman emperor in Constantinople, dying in the Fall of Constantinople to the Ottomans in 1453.

Roman emperor

The Roman emperor was the ruler of the Roman Empire during the imperial period (starting in 27 BC). The emperors used a variety of different titles throughout history. Often when a given Roman is described as becoming "emperor" in English, it reflects his taking of the title "Augustus" or "Caesar". Another title often used was "imperator", originally a military honorific. Early Emperors also used the title "princeps" (first citizen). Emperors frequently amassed republican titles, notably "princeps senatus", "consul" and "pontifex maximus".

The legitimacy of an emperor's rule depended on his control of the army and recognition by the Senate; an emperor would normally be proclaimed by his troops, or invested with imperial titles by the Senate, or both. The first emperors reigned alone; later emperors would sometimes rule with co-emperors and divide administration of the empire between them.

The Romans considered the office of emperor to be distinct from that of a king. The first emperor, Augustus, resolutely refused recognition as a monarch. Although Augustus could claim that his power was authentically republican, his successor, Tiberius, could not convincingly make the same claim. Nonetheless, for the first three hundred years of Roman emperors, from Augustus until Diocletian, efforts were made to portray the emperors as leaders of a republic.

From Diocletian, whose tetrarchic reforms also divided the position into one emperor in the West and one in the East, until the end of the Empire, emperors ruled in an openly monarchic style and did not preserve the nominal principle of a republic, but the contrast with "kings" was maintained: although the imperial succession was generally hereditary, it was only hereditary if there was a suitable candidate acceptable to the army and the bureaucracy, so the principle of automatic inheritance was not adopted. Elements of the Republican institutional framework (senate, consuls, and magistrates) were preserved until the very end of the Western Empire.

The "Byzantine" emperors from Heraclius in 629 and onwards adopted the title of "basileus" (), which had originally meant "king" in Greek but became a title reserved solely for the Roman emperor and the ruler of the Sasanian Empire. Other kings were then referred to as "rēgas".

In addition to their pontifical office, some emperors were given divine status after death. With the eventual hegemony of Christianity, the emperor came to be seen as God's chosen ruler, as well as a special protector and leader of the Christian Church on Earth, although in practice an emperor's authority on Church matters was subject to challenge.

Due to the cultural rupture of the Turkish conquest, most western historians treat Constantine XI as the last meaningful claimant to the title Roman Emperor. From 1453, one of the titles used by the Ottoman Sultans was "Caesar of Rome" (Turkish: "Kayser-i Rum"), part of their titles until the Ottoman Empire ended in 1922. A Byzantine group of claimant Roman emperors existed in the Empire of Trebizond until its conquest by the Ottomans in 1461, though they had used a modified title since 1282.

Eastern emperors in Constantinople had been recognized and accepted as Roman emperors both in the East, which they ruled, and by the Papacy and Germanic kingdoms of the West until the deposition of Constantine VI and accession of Irene of Athens as Empress regnant in 797. Objecting to a woman ruling the Roman Empire in her own right and issues with the eastern clergy, the Papacy would then create a rival lineage of Roman emperors in western Europe, the Holy Roman Emperors, which ruled the Holy Roman Empire for most of the period between 800 and 1806. These Emperors were never recognized as Roman emperors by the court in Constantinople.

Modern historians conventionally regard Augustus as the first Emperor whereas Julius Caesar is considered the last dictator of the Roman Republic, a view having its origins in the Roman writers Plutarch, Tacitus and Cassius Dio. However, the majority of Roman writers, including Josephus, Pliny the Younger, Suetonius and Appian, as well as most of the ordinary people of the Empire, thought of Julius Caesar as the first Emperor.

At the end of the Roman Republic no new, and certainly no single, title indicated the individual who held supreme power. Insofar as "emperor" could be seen as the English translation of imperator, then Julius Caesar had been an emperor, like several Roman generals before him. Instead, by the end of the civil wars in which Julius Caesar had led his armies, it became clear that there was certainly no consensus to return to the old-style monarchy, but that the period when several officials, bestowed with equal power by the senate, would fight one another had come to an end.

Julius Caesar, and then Augustus after him, accumulated offices and titles of the highest importance in the Republic, making the power attached to those offices permanent, and preventing anyone with similar aspirations from accumulating or maintaining power for themselves. However, Julius Caesar, unlike those after him, did so without the Senate's vote and approval.

Julius Caesar held the Republican offices of consul four times and dictator five times, was appointed dictator in perpetuity ("dictator perpetuo") in 45 BC and had been "pontifex maximus" for a long period. He gained these positions by senatorial consent. By the time of his assassination, he was the most powerful man in the Roman world.

In his will, Caesar appointed his adopted son Octavian as his heir. On Caesar's death, Octavian inherited his adoptive father's property and lineage, the loyalty of most of his allies and – again through a formal process of senatorial consent – an increasing number of the titles and offices that had accrued to Caesar. A decade after Caesar's death, Octavian's victory over his erstwhile ally Mark Antony at Actium put an end to any effective opposition and confirmed Octavian's supremacy.

In 27 BC, Octavian appeared before the Senate and offered to retire from active politics and government; the Senate not only requested he remain, but increased his powers and made them lifelong, awarding him the title of Augustus (the elevated or divine one, somewhat less than a god but approaching divinity). Augustus stayed in office until his death; the sheer breadth of his superior powers as "princeps" and permanent "imperator" of Rome's armies guaranteed the peaceful continuation of what nominally remained a republic. His "restoration" of powers to the Senate and the people of Rome was a demonstration of his "auctoritas" and pious respect for tradition.

Some later historians such as Tacitus would say that even at Augustus' death, the true restoration of the Republic might have been possible. Instead, Augustus actively prepared his adopted son Tiberius to be his successor and pleaded his case to the Senate for inheritance on merit. The Senate disputed the issue but eventually confirmed Tiberius as "princeps". Once in power, Tiberius took considerable pains to observe the forms and day-to-day substance of republican government.

Rome had no single constitutional office, title or rank exactly equivalent to the English title "Roman emperor". Romans of the Imperial era used several titles to denote their emperors, and all were associated with the pre-Imperial, Republican era.

The emperor's legal authority derived from an extraordinary concentration of individual powers and offices that were extant in the Republic rather than from a new political office; emperors were regularly elected to the offices of consul and censor. Among their permanent privileges were the traditional Republican title of "princeps senatus" (leader of the Senate) and the religious office of "pontifex maximus" (chief priest of the College of Pontiffs). Every emperor held the latter office and title until Gratian surrendered it in AD 382 to Pope Siricius; it eventually became an auxiliary honor of the Bishop of Rome.

These titles and offices conferred great personal prestige ("dignitas") but the basis of an emperor's powers derived from his "auctoritas": this assumed his greater powers of command ("imperium maius") and tribunician power ("tribunicia potestas") as personal qualities, separate from his public office. As a result, he formally outranked provincial governors and ordinary magistrates. He had the right to enact or revoke sentences of capital punishment, was owed the obedience of private citizens ("privati") and by the terms of the "ius auxiliandi" could save any plebeian from any patrician magistrate's decision. He could veto any act or proposal of any magistrate, including the tribunes of the people ("ius intercedendi" or "ius intercessionis"). His person was held to be sacrosanct.

Roman magistrates on official business were expected to wear the form of toga associated with their office; different togas were worn by different ranks; senior magistrates had the right to togas bordered with purple. A triumphal "imperator" of the Republic had the right to wear the "toga picta" (of solid purple, richly embroidered) for the duration of the triumphal rite. During the Late Republic, the most powerful had this right extended. Pompey and Caesar are both thought to have worn the triumphal toga and other triumphal dress at public functions. Later emperors were distinguished by wearing "togae purpurae", purple togas; hence the phrase "to don the purple" for the assumption of imperial dignity.

The titles customarily associated with the imperial dignity are "imperator" ("commander"), which emphasizes the emperor's military supremacy and is the source of the English word "emperor"; "Caesar", which was originally a name but came to be used for the designated heir (as "Nobilissimus Caesar", "Most Noble Caesar") and was retained upon accession. The ruling emperor's title was the descriptive "Augustus" ("majestic" or "venerable", which had tinges of the divine), which was adopted upon accession. In Greek, these three titles were rendered as "autokratōr" (""), "kaisar" (""), and "augoustos" ("") or "sebastos" ("") respectively. In Diocletian's Tetrarchy, the traditional seniorities were maintained: "Augustus" was reserved for the two senior emperors and "Caesar" for the two junior emperors – each delegated a share of power and responsibility but each an emperor-in-waiting, should anything befall his senior.

As "princeps senatus" (lit., "first man of the senate"), the emperor could receive foreign embassies to Rome; some emperors (such as Tiberius) are known to have delegated this task to the Senate. In modern terms these early emperors would tend to be identified as chiefs of state. The office of "princeps senatus", however, was not a magistracy and did not entail "imperium". At some points in the Empire's history, the emperor's power was nominal; powerful praetorian prefects, masters of the soldiers and on a few occasions, other members of the Imperial household including Imperial mothers and grandmothers were the true source of power.

The title "imperator" dates back to the Roman Republic, when a victorious commander could be hailed as "imperator" in the field by his troops. The Senate could then award or withhold the extraordinary honour of a triumph; the triumphal commander retained the title until the end of his magistracy. In Roman tradition, the first triumph was that of Romulus, but the first attested recipient of the title "imperator" in a triumphal context is Aemilius Paulus in 189 BC. It was a title held with great pride: Pompey was hailed "imperator" more than once, as was Sulla, but it was Julius Caesar who first used it permanently – according to Dio, this was a singular and excessive form of flattery granted by the Senate, passed to Caesar's adopted heir along with his name and virtually synonymous with it.

In 38 BC Agrippa refused a triumph for his victories under Octavian's command, and this precedent established the rule that the "princeps" should assume both the salutation and title of "imperator". It seems that from then on Octavian (later the first emperor Augustus) used "imperator" as a first name ("praenomen"): "Imperator Caesar" not "Caesar imperator". From this the title came to denote the supreme power and was commonly used in that sense. Otho was the first to imitate Augustus, but only with Vespasian did "imperator" (emperor) become the official title by which the ruler of the Roman Empire was known.

The word "princeps" (plural "principes"), meaning "first", was a republican term used to denote the leading citizen(s) of the state. It was a purely honorific title with no attached duties or powers. It was the title most preferred by Caesar Augustus as its use implies only primacy, as opposed to another of his titles, "imperator", which implies dominance. "Princeps", because of its republican connotation, was most commonly used to refer to the emperor in Latin (although the emperor's actual constitutional position was essentially "pontifex maximus with tribunician power and "imperium" superseding all others") as it was in keeping with the façade of the restored Republic; the Greek word "basileus" ("king") was modified to be synonymous with emperor (and primarily came into favour after the reign of Heraclius) as the Greeks had no republican sensibility and openly viewed the emperor as a monarch.

In the era of Diocletian and beyond, "princeps" fell into disuse and was replaced with "dominus" ("lord"); later emperors used the formula "Imperator Caesar NN. Pius Felix (Invictus) Augustus": NN representing the individual's personal name; Pius Felix meaning "Pious and Blest"; and Invictus meaning "undefeated". The use of "princeps" and "dominus" broadly symbolise the differences in the empire's government, giving rise to the era designations "Principate" and "Dominate".

In 293, following the Crisis of the Third Century which had severely damaged Imperial administration, Emperor Diocletian enacted sweeping reforms that washed away many of the vestiges and façades of republicanism which had characterized the Augustan order in favor of a more frank autocracy. As a result, historians distinguish the Augustan period as the principate and the period from Diocletian to the 7th-century reforms of Emperor Heraclius as the dominate (from the Latin for "lord".)

Reaching back to the oldest traditions of job-sharing in the republic, however, Diocletian established at the top of this new structure the Tetrarchy ("rule of four") in an attempt to provide for smoother succession and greater continuity of government. Under the Tetrarchy, Diocletian set in place a system of co-emperors, styled "Augustus", and junior emperors, styled "Caesar". When a co-emperor retired (as Diocletian and his co-emperor Maximian did in 305) or died, a junior "Caesar" would succeed him and the co-emperors would appoint new Caesars as needed.

The four members of the Imperial college (as historians call the arrangement) shared military and administrative challenges by each being assigned specific geographic areas of the empire. From this innovation, often but not consistently repeated over the next 187 years, comes the notion of an east-west partition of the empire that became popular with historians long after the practice had stopped. The two halves of empire, while often run as "de facto" separate entities day-to-day, were always considered and seen, legally and politically, as separate administrative divisions of a single, insoluble "imperium" by the Romans of the time.
The final period of co-emperorship began in 395, when Emperor Theodosius I's sons Arcadius and Honorius succeeded as co-emperors. Eighty-five years later, following Germanic migrations which had reduced the empire's effective control across Brittania, Gaul and Hispania and a series of military coup d'état which drove Emperor Nepos out of Italy, the idea of dividing the position of emperor was formally abolished by Emperor Zeno (480).

The Roman Empire survived in the east until 1453, but the marginalization of the former heartland of Italy to the empire had a profound cultural impact on the empire and the position of emperor. In 620, the official language was changed from Latin to Greek. The Greek-speaking inhabitants were "Romaioi" (Ῥωμαῖοι), and were still considered Romans by themselves and the populations of Eastern Europe, the Near East, India, and China. But many in Western Europe began to refer to the political entity as the "Greek Empire". The evolution of the church in the no-longer imperial city of Rome and the church in the now supreme Constantinople began to follow divergent paths, culminating in the schism between the Roman Catholic and Eastern Orthodox faiths. The position of emperor was increasingly influenced by Near Eastern concepts of kingship. Starting with Emperor Heraclius, Roman emperors styled themselves "King of Kings" (from the imperial Persian "Shahanshah") from 627 and "Basileus" (from the title used by Alexander the Great) from 629. The later period of the empire is today called the Byzantine Empire as a matter of scholarly convention.

Although these are the most common offices, titles, and positions, not all Roman emperors used them, nor were all of them used at the same time in history. The consular and censorial offices especially were not an integral part of the Imperial dignity, and were usually held by persons other than the reigning emperor.

When Augustus established the "Princeps", he turned down supreme authority in exchange for a collection of various powers and offices, which in itself was a demonstration of his "auctoritas" ("authority"). As holding "princeps senatus", the emperor declared the opening and closure of each Senate session, declared the Senate's agenda, imposed rules and regulation for the Senate to follow, and met with foreign ambassadors in the name of the Senate. Being "pontifex maximus" made the emperor the chief administrator of religious affairs, granting him the power to conduct all religious ceremonies, consecrate temples, control the Roman calendar (adding or removing days as needed), appoint the vestal virgins and some flamens, lead the Collegium Pontificum, and summarize the dogma of the Roman religion.

While these powers granted the emperor a great deal of personal pride and influence, they did not include legal authority. In 23 BC, Augustus gave the emperorship its legal power. The first was "Tribunicia Potestas", or the powers of the tribune of the plebs without actually holding the office (which would have been impossible, since a tribune was by definition a plebeian, whereas Augustus, although born into a plebeian family, had become a patrician when he was adopted into the "gens Julia"). This endowed the emperor with inviolability (sacrosanctity) of his person, and the ability to pardon any civilian for any act, criminal or otherwise. By holding the powers of the tribune, the emperor could prosecute anyone who interfered with the performance of his duties. The emperor's tribuneship granted him the right to convene the Senate at his will and lay proposals before it, as well as the ability to veto any act or proposal by any magistrate, including the actual tribune of the plebeians. Also, as holder of the tribune's power, the emperor would convoke the Council of the People, lay legislation before it, and served as the council's president. But his tribuneship only granted him power within Rome itself. He would need another power to veto the act of governors and that of the consuls while in the provinces.

To solve this problem, Augustus managed to have the emperor be given the right to hold two types of imperium. The first being "consular imperium" while he was in Rome, and "imperium maius" outside of Rome. While inside the walls of Rome, the reigning consuls and the emperor held equal authority, each being able to veto each other's proposals and acts, with the emperor holding all of the consul's powers. But outside of Rome, the emperor outranked the consuls and could veto them without the same effects on himself. Imperium Maius also granted the emperor authority over all the provincial governors, making him the ultimate authority in provincial matters and gave him the supreme command of all of Rome's legions. With Imperium Maius, the emperor was also granted the power to appoint governors of imperial provinces without the interference of the Senate. Also, Imperium Maius granted the emperor the right to veto the governors of the provinces and even the reigning consul while in the provinces.

The nature of the imperial office and the Principate was established under Julius Caesar's heir and posthumously adopted son, Caesar Augustus, and his own heirs, the descendants of his wife Livia from her first marriage to a scion of the distinguished Claudian clan. This Julio-Claudian dynasty came to an end when the Emperor Nero – a great-great-grandson of Augustus through his daughter and of Livia through her son – was deposed in 68.

Nero was followed by a succession of usurpers throughout 69, commonly called the "Year of the Four Emperors". The last of these, Vespasian, established his own Flavian dynasty. Nerva, who replaced the last Flavian emperor, Vespasian's son Domitian, in 96, was elderly and childless, and chose therefore to adopt an heir, Trajan, from outside his family. When Trajan acceded to the purple he chose to follow his predecessor's example, adopting Hadrian as his own heir, and the practice then became the customary manner of imperial succession for the next century, producing the "Five Good Emperors" and the Empire's period of greatest stability.

The last of the Good Emperors, Marcus Aurelius, chose his natural son Commodus as his successor rather than adopting an heir. Commodus's misrule led to his murder on 31 December 192, following which a brief period of instability quickly gave way to Septimius Severus, who established the Severan dynasty which, except for an interruption in 217–218 when Macrinus was emperor, held the purple until 235.

The accession of Maximinus Thrax marks both the close and the opening of an era. It was one of the last attempts by the increasingly impotent Roman Senate to influence the succession. Yet it was the second time that a man had achieved the purple while owing his advancement purely to his military career; both Vespasian and Septimius Severus had come from noble or middle-class families, while Thrax was born a commoner. He never visited the city of Rome during his reign, which marks the beginning of a series of "barracks emperors" who came from the army. Between 235 and 285 over a dozen emperors achieved the purple, but only Valerian and Carus managed to secure their own sons' succession to the throne; both dynasties died out within two generations.

The accession on 20 November 284, of Diocletian, the lower-class, Greek-speaking Dalmatian commander of Carus's and Numerian's household cavalry ("protectores domestici"), marked major innovations in Rome's government and constitutional theory. Diocletian, a traditionalist and religious conservative, attempted to secure efficient, stable government and a peaceful succession with the establishment of the Tetrarchy. The empire was divided into East and West, each ruled by an Augustus assisted by a Caesar as emperor-in-waiting. These divisions were further subdivided into new or reformed provinces, administered by a complex, hierarchic bureaucracy of unprecedented size and scope. Diocletian's own court was based at Nicomedia. His co-Augustus, Maximian, was based at Mediolanum (modern Milan). Their courts were peripatetic, and Imperial progressions through the provinces made much use of the impressive, theatrical adventus, or "Imperial arrival" ceremony, which employed an elaborate choreography of etiquette to emphasise the emperor's elevation above other mortals. Hyperinflation of imperial honours and titles served to distinguish the "Augusti" from their "Caesares", and Diocletian, as senior "Augustus", from his colleague Maximian. The senior "Augustus" in particular was made a separate and unique being, accessible only through those closest to him. The overall unity of the Empire still required the highest investiture of power and status in one man.

The Tetrarchy ultimately degenerated into civil war, but the eventual victor, Constantine the Great, restored Diocletian's division of Empire into East and West. He kept the East for himself and founded his city of Constantinople as its new capital. Constantine's own dynasty was also soon swallowed up in civil war and court intrigue until it was replaced, briefly, by Julian the Apostate's general Jovian and then, more permanently, by Valentinian I and the dynasty he founded in 364. Though a soldier from a low middle-class background, Valentinian was made emperor by a conclave of senior generals and civil officials.

Theodosius I acceded to the purple in the East in 379 and in the West in 394. He outlawed paganism and made Christianity the Empire's official religion. He was the last emperor to rule over a united Roman Empire; the distribution of the East to his son Arcadius and the West to his son Honorius after his death in 395 represented a permanent division.

In the West, the office of emperor soon degenerated into being little more than a puppet of a succession of Germanic tribal kings, until finally the Heruli Odoacer simply overthrew the child-emperor Romulus Augustulus in 476, shipped the imperial regalia to the Emperor Zeno in Constantinople and became King of Italy. Though during his own lifetime Odoacer maintained the legal fiction that he was actually ruling Italy as the viceroy of Zeno, historians mark 476 as the traditional date of the fall of the Roman Empire in the West. Large parts of Italy (Sicily, the south part of the peninsula, Ravenna, Venice etc.), however, remained under actual imperial rule from Constantinople for centuries, with imperial control slipping or becoming nominal only as late as the 11th century. In the East, the Empire continued until the fall of Constantinople to the Ottoman Turks in 1453. Although known as the Byzantine Empire by contemporary historians, the Empire was simply known as the Roman Empire to its citizens and neighboring countries.

The line of Roman emperors in the Eastern Roman Empire continued unbroken at Constantinople until the capture of Constantinople in 1204 by the Fourth Crusade. In the wake of this action, four lines of Emperors emerged, each claiming to be the legal successor: the Empire of Thessalonica, evolving from the Despotate of Epirus, which was reduced to impotence when its founder Theodore Komnenos Doukas was defeated, captured and blinded by the Bulgarian Emperor Ivan Asen III; the Latin Empire, which came to an end when the Empire of Nicaea recovered Constantinople in 1261; the Empire of Trebizond, whose importance declined over the 13th century, and whose claims were simply ignored; and the Empire of Nicaea, whose claims based on kinship with the previous emperors, control of the Patriarch of Constantinople, and possession of Constantinople through military prowess, prevailed. The successors of the emperors of Nicaea continued until the fall of Constantinople in 1453 under Constantine XI Palaiologos.

These emperors eventually normalized the imperial dignity into the modern conception of an emperor, incorporated it into the constitutions of the state, and adopted the aforementioned title "Basileus kai autokratōr Rhomaiōn" ("Emperor and Autocrat of the Romans"). They had also ceased to use Latin as the language of state after Emperor Heraclius (d. 641 AD). Historians have customarily treated the state of these later Eastern emperors under the name "Byzantine Empire". It is important to note, however, that the adjective "Byzantine", although historically used by Eastern Roman authors in a metonymic sense, was never an official term.

Constantine XI Palaiologos was the last reigning Roman emperor. A member of the Palaiologos dynasty, he ruled the remnant of the Eastern Roman Empire from 1449 until his death in 1453 defending its capital Constantinople.

He was born in Mystra as the eighth of ten children of Manuel II Palaiologos and Helena Dragaš, the daughter of the Serbian prince Constantine Dragaš of Kumanovo. He spent most of his childhood in Constantinople under the supervision of his parents. During the absence of his older brother in Italy, Constantine was regent in Constantinople from 1437–40.

Before the beginning of the siege, Mehmed the Conqueror made an offer to Constantine XI. In exchange for the surrender of Constantinople, the emperor's life would be spared and he would continue to rule in Mystra. Constantine refused this offer. Instead he led the defense of the city and took an active part in the fighting along the land walls. At the same time, he used his diplomatic skills to maintain the necessary unity between the Genovese, Venetian, and Byzantine troops. As the city fell on May 29, 1453, Constantine is said to have remarked: "The city is fallen but I am alive." Realizing that the end had come, he reportedly discarded his purple cloak and led his remaining soldiers into a final charge, in which he was killed. With his death, Roman imperial succession came to an end, almost 1500 years after Augustus.

After the fall of Constantinople, Thomas Palaiologos, brother of Constantine XI, was elected emperor and tried to organize the remaining forces. His rule came to an end after the fall of the last major Byzantine city, Corinth. He then moved in Italy and continued to be recognized as Eastern emperor by the Christian powers.

His son Andreas Palaiologos continued claims on the Byzantine throne until he sold the title to Ferdinand of Aragon and Isabella of Castile, the grandparents of Holy Roman Emperor Charles V.

The concept of the Roman Empire was renewed in the West with the coronation of the king of the Franks, Charlemagne (Charles the Great), as Roman emperor by the Pope on Christmas Day, 800. This coronation had its roots in the decline of influence of the Pope in the affairs of the Byzantine Empire at the same time the Byzantine Empire declined in influence over politics in the West. The Pope saw no advantage to be derived from working with the Byzantine Empire, but as George Ostrogorsky points out, "an alliance with the famous conqueror of the Lombards, on the other hand... promised much".

The immediate response of the Eastern Roman emperor was not welcoming. "At that time it was axiomatic that there could be only one Empire as there could be only one church", writes Ostrogorsky. "The coronation of Charles the Great violated all traditional ideas and struck a hard blow at Byzantine interests, for hitherto Byzantium, the new Rome, had unquestionably been regarded as the sole Empire which had taken over the inheritance of the old Roman "imperium". Conscious of its imperial rights, Byzantium could only consider the elevation of Charles the Great to be an act of usurpation."

Nikephoros I chose to ignore Charlemagne's claim to the imperial title, clearly recognizing the implications of this act. According to Ostrogorsky, "he even went so far as to refuse the Patriarch Nicephorus permission to dispatch the customary "synodica" to the Pope." Meanwhile, Charlemagne's power steadily increased: he subdued Istria and several Dalmatian cities during the reign of Irene, and his son Pepin brought Venice under Western hegemony, despite a successful counter-attack by the Byzantine fleet. Unable to counter this encroachment on Byzantine territory, Nikephoros' successor Michael I Rangabe capitulated; in return for the restoration of the captured territories, Michael sent Byzantine delegates to Aachen in 812 who recognized Charlemagne as "Basileus". Michael did not recognize him as "Basileus" of the Romans, however, which was a title that he reserved for himself.

This line of Roman emperors was actually generally Germanic rather than Roman, but maintained their Roman-ness as a matter of principle. These emperors used a variety of titles (most frequently ""Imperator Augustus"") before finally settling on "Imperator Romanus Electus" ("Elected Roman Emperor"). Historians customarily assign them the title "Holy Roman Emperor", which has a basis in actual historical usage, and treat their "Holy Roman Empire" as a separate institution. To Latin Catholics of the time, the Pope was the temporal authority as well as spiritual authority, and as Bishop of Rome he was recognized as having the power to anoint or crown a new Roman emperor. The last man to be crowned by the pope (although in Bologna, not Rome) was Charles V. All his successors bore only a title of "Elected Roman Emperor".

This line of Emperors lasted until 1806 when Francis II dissolved the Empire during the Napoleonic Wars. Despite the existence of later potentates styling themselves "emperor", such as the Napoleons, the Habsburg Emperors of Austria, and the Hohenzollern heads of the German Reich, this marked the end of the Western Empire. Although there is a living heir, Karl von Habsburg, to the Habsburg dynasty, as well as a Pope and pretenders to the positions of the electors, and although all the medieval coronation regalia are still preserved in Austria, the legal abolition of all aristocratic prerogatives of the former electors and the imposition of republican constitutions in Germany and Austria render quite remote any potential for a revival of the Holy Roman Empire.

Theodosius was the last Emperor who ruled over the whole Empire. After his death in 395, he gave the two halves of the Empire to his two sons Arcadius and Honorius; Arcadius became ruler in the East, with his capital in Constantinople, and Honorius became ruler in the West, with his capital in Milan and later Ravenna. The Roman state would continue to have two different emperors with different seats of power throughout the 5th century, though the Eastern Romans considered themselves to be the only ones who were fully Roman. Latin was used in official writings as much as, if not more than, Greek and the two halves were nominally, culturally and historically, if not politically, the same state.

History of the Roman Empire

The history of the Roman Empire covers the history of ancient Rome from the fall of the Roman Republic in 27 BC until the abdication of the last Western emperor in 476 AD. Rome had begun expanding shortly after the founding of the Republic in the 6th century BC, though it did not expand outside of the Italian Peninsula until the 3rd century BC. Civil war engulfed the Roman state in the mid 1st century BC, first between Julius Caesar and Pompey, and finally between Octavian and Mark Antony. Antony was defeated at the Battle of Actium in 31 BC. In 27 BC the Senate and People of Rome made Octavian "imperator" ("commander") thus beginning the Principate, the first epoch of Roman imperial history usually dated from 27 BC to 284 AD; they later awarded him the name Augustus, "the venerated". The success of Augustus in establishing principles of dynastic succession was limited by his outliving a number of talented potential heirs: the Julio-Claudian dynasty lasted for four more emperors—Tiberius, Caligula, Claudius, and Nero—before it yielded in 69 AD to the strife-torn Year of Four Emperors, from which Vespasian emerged as victor. Vespasian became the founder of the brief Flavian dynasty, to be followed by the Nerva–Antonine dynasty which produced the "Five Good Emperors": Nerva, Trajan, Hadrian, Antoninus Pius and the philosophically inclined Marcus Aurelius. In the view of the Greek historian Dio Cassius, a contemporary observer, the accession of the emperor Commodus in 180 AD marked the descent "from a kingdom of gold to one of rust and iron"—a famous comment which has led some historians, notably Edward Gibbon, to take Commodus' reign as the beginning of the decline of the Roman Empire.

In 212, during the reign of Caracalla, Roman citizenship was granted to all freeborn inhabitants of the Empire. But despite this gesture of universality, the Severan dynasty was tumultuous—an emperor's reign was ended routinely by his murder or execution—and following its collapse, the Roman Empire was engulfed by the Crisis of the Third Century, a period of invasions, civil strife, economic disorder, and plague. In defining historical epochs, this crisis is typically viewed as marking the start of the Late Roman Empire, and also the transition from Classical Antiquity to Late Antiquity. Diocletian (reigned 284–305) brought the Empire back from the brink, but declined the role of "princeps" and became the first emperor to be addressed regularly as "domine", "master" or "lord". This marked the end of the Principate, and the beginning of the Dominate. Diocletian's reign also brought the Empire's most concerted effort against the perceived threat of Christianity, the "Great Persecution". The state of absolute monarchy that began with Diocletian endured until the fall of the Eastern Roman Empire in 1453.

Diocletian divided the empire into four regions, each ruled by a separate Emperor (the Tetrarchy). Confident that he fixed the disorders plaguing Rome, he abdicated along with his co-emperor, and the Tetrarchy soon collapsed. Order was eventually restored by Constantine, who became the first emperor to convert to Christianity, and who established Constantinople as the new capital of the eastern empire. During the decades of the Constantinian and Valentinian dynasties, the Empire was divided along an east–west axis, with dual power centers in Constantinople and Rome. The reign of Julian, who under the influence of his adviser Mardonius attempted to restore Classical Roman and Hellenistic religion, only briefly interrupted the succession of Christian emperors. Theodosius I, the last emperor to rule over both East and West, died in 395 AD after making Christianity the official religion of the Empire.

The Western Roman Empire began to disintegrate in the early 5th century as Germanic migrations and invasions overwhelmed the capacity of the Empire to assimilate the migrants and fight off the invaders. The Romans were successful in fighting off all invaders, most famously Attila the Hun, though the Empire had assimilated so many Germanic peoples of dubious loyalty to Rome that the Empire started to dismember itself. Most chronologies place the end of the Western Roman empire in 476, when Romulus Augustulus was forced to abdicate to the Germanic warlord Odoacer. By placing himself under the rule of the Eastern Emperor, rather than naming himself Emperor as other Germanic chiefs had done, Odoacer ended the Western Empire by ending the line of Western Emperors. The eastern Empire exercised diminishing control over the west over the course of the next century. The empire in the East—known today as the Byzantine Empire, but referred to in its time as the "Roman Empire" or by various other names—ended in 1453 with the death of Constantine XI and the fall of Constantinople to the Ottoman Turks.

Octavian, the grandnephew and adopted son of Julius Caesar, had made himself a central military figure during the chaotic period following Caesar's assassination. In 43 BC at the age of twenty he became one of the three members of the Second Triumvirate, a political alliance with Marcus Lepidus and Mark Antony. Octavian and Antony defeated the last of Caesar's assassins in 42 BC at the Battle of Philippi, although after this point, tensions began to rise between the two. The triumvirate ended in 32 BC, torn apart by the competing ambitions of its members: Lepidus was forced into exile and Antony, who had allied himself with his lover Queen Cleopatra VII of Egypt, committed suicide in 30 BC following his defeat at the Battle of Actium (31 BC) by the fleet of Octavian. Octavian subsequently annexed Egypt to the empire.

Now sole ruler of Rome, Octavian began a full-scale reformation of military, fiscal and political matters. The Senate granted him power over appointing its membership and over the gov
lic, and as such he operated within the existing constitutional machinery. He thus rejected titles that Romans associated with monarchy, such as "rex" ("king"). The dictatorship, a military office in the early Republic typically lasting only for the six-month military campaigning season, had been resurrected first by Sulla in the late 80s BC and then by Julius Caesar in the mid-40s; the title "dictator" was never again used. As the adopted heir of Julius Caesar, Augustus had taken "Caesar" as a component of his name, and handed down the name to his heirs of the Julio-Claudian dynasty. With Vespasian, one of the first emperors outside the dynasty, "Caesar" evolved from a family name to a formal title.

Augustus created his novel and historically unique position by consolidating the constitutional powers of several Republican offices. He renounced his consulship in 23 BC, but retained his consular "imperium", leading to a second compromise between Augustus and the Senate known as the "Second Settlement". Augustus was granted the authority of a tribune ("tribunicia potestas"), though not the title, which allowed him to call together the Senate and people at will and lay business before it, veto the actions of either the Assembly or the Senate, preside over elections, and it gave him the right to speak first at any meeting. Also included in Augustus's tribunician authority were powers usually reserved for the Roman censor; these included the right to supervise public morals and scrutinize laws to ensure they were in the public interest, as well as the ability to hold a census and determine the membership of the Senate. No tribune of Rome ever had these powers, and there was no precedent within the Roman system for consolidating the powers of the tribune and the censor into a single position, nor was Augustus ever elected to the office of Censor. Whether censorial powers were granted to Augustus as part of his tribunician authority, or he simply assumed those, is a matter of debate.

In addition to those powers, Augustus was granted sole "imperium" within the city of Rome itself; all armed forces in the city, formerly under the control of the prefects, were now under the sole authority of Augustus. Additionally, Augustus was granted "imperium proconsulare maius" (power over all proconsuls), the right to interfere in any province and override the decisions of any governor. With maius imperium, Augustus was the only individual able to grant a triumph to a successful general as he was ostensibly the leader of the entire Roman army.
The Senate re-classified the provinces at the frontiers (where the vast majority of the legions were stationed) as imperial provinces, and gave control of those to Augustus. The peaceful provinces were re-classified as senatorial provinces, governed as they had been during the Republic by members of the Senate sent out annually by the central government. Senators were prohibited from so much as visiting Roman Egypt, given its great wealth and history as a base of power for opposition to the new emperor. Taxes from the Imperial provinces went into the "fiscus", the fund administrated by persons chosen by and answerable to Augustus. The revenue from senatorial provinces continued to be sent to the state treasury "(aerarium)," under the supervision of the Senate.

The Roman legions, which had reached an unprecedented 50 in number because of the civil wars, were reduced to 28. Several legions, particularly those with members of doubtful loyalties, were simply demobilised. Other legions were united, a fact hinted by the title "Gemina" (Twin). Augustus also created nine special cohorts to maintain peace in Italia, with three, the Praetorian Guard, kept in Rome. Control of the "fiscus" enabled Augustus to ensure the loyalty of the legions through their pay.

Augustus completed the conquest of Hispania, while subordinate generals expanded Roman possessions in Africa and Asia Minor. Augustus' final task was to ensure an orderly succession of his powers. His stepson Tiberius had conquered Pannonia, Dalmatia, Raetia, and temporarily Germania for the Empire, and was thus a prime candidate. In 6 BC, Augustus granted some of his powers to his stepson, and soon after he recognized Tiberius as his heir. In 13 AD, a law was passed which extended Augustus' powers over the provinces to Tiberius, so that Tiberius' legal powers were equivalent to, and independent from, those of Augustus.

Attempting to secure the borders of the empire upon the rivers Danube and Elbe, Augustus ordered the invasions of Illyria, Moesia, and Pannonia (south of the Danube), and Germania (west of the Elbe). At first everything went as planned, but then disaster struck. The Illyrian tribes revolted and had to be crushed, and three full legions under the command of Publius Quinctilius Varus were ambushed and destroyed at the Battle of the Teutoburg Forest in AD 9 by Germanic tribes led by Arminius. Being cautious, Augustus secured all territories west of Rhine and contented himself with retaliatory raids. The rivers Rhine and Danube became the permanent borders of the Roman empire in the North.

In 14 AD Augustus died at the age of seventy-five, having ruled the empire for forty years, and was succeeded as emperor by Tiberius.

The Augustan Age is not as well documented as the age of Caesar and Cicero. Livy wrote his history during Augustus's reign and covered all of Roman history through 9 BC, but only epitomes survive of his coverage of the late Republican and Augustan periods. Important primary sources for the Augustan period include:

Works of poetry such as Ovid's "Fasti" and Propertius's Fourth Book, legislation and engineering also provide important insights into Roman life of the time. Archaeology, including maritime archaeology, aerial surveys, epigraphic inscriptions on buildings, and Augustan coinage, has also provided valuable evidence about economic, social and military conditions.

Secondary ancient sources on the Augustan Age include Tacitus, Dio Cassius, Plutarch and Lives of the Twelve Caesars by Suetonius. Josephus's "Jewish Antiquities" is the important source for Judea,which became a province during Augustus's reign.

Augustus had three grandsons by his daughter Julia the Elder: Gaius Caesar, Lucius Caesar and Agrippa Postumus. None of the three lived long enough to succeed him. He therefore was succeeded by his stepson Tiberius. Tiberius was the son of Livia, the third wife of Octavian, by her first marriage to Tiberius Nero. Augustus was a scion of the "gens" Julia (the Julian family), one of the most ancient patrician clans of Rome, while Tiberius was a scion of the "gens" Claudia, only slightly less ancient than the Julians. Their three immediate successors were all descended both from the "gens" Claudia, through Tiberius' brother Nero Claudius Drusus, and from "gens" Julia, either through Julia the Elder, Augustus' daughter from his first marriage (Caligula and Nero), or through Augustus' sister Octavia Minor (Claudius). Historians thus refer to their dynasty as "Julio-Claudian".

The early years of Tiberius's reign were relatively peaceful. Tiberius secured the overall power of Rome and enriched its treasury. However, his rule soon became characterized by paranoia. He began a series of treason trials and executions, which continued until his death in 37. He left power in the hands of the commander of the guard, Lucius Aelius Sejanus. Tiberius himself retired to live at his villa on the island of Capri in 26, leaving administration in the hands of Sejanus, who carried on the persecutions with contentment. Sejanus also began to consolidate his own power; in 31 he was named co-consul with Tiberius and married Livilla, the emperor's niece. At this point he was "hoist by his own petard": the emperor's paranoia, which he had so ably exploited for his own gain, turned against him. Sejanus was put to death, along with many of his associates, the same year. The persecutions continued until Tiberius' death in 37.

At the time of Tiberius's death most of the people who might have succeeded him had been killed. The logical successor (and Tiberius' own choice) was his 24-year-old grandnephew, Gaius, better known as "Caligula" ("little boots"). Caligula was a son of Germanicus and Agrippina the Elder. His paternal grandparents were Nero Claudius Drusus and Antonia Minor, and his maternal grandparents were Marcus Vipsanius Agrippa and Julia the Elder. He was thus a descendant of both Augustus and Livia.

Caligula started out well, by putting an end to the persecutions and burning his uncle's records. Unfortunately, he quickly lapsed into illness. The Caligula that emerged in late 37 demonstrated features of mental instability that led modern commentators to diagnose him with such illnesses as encephalitis, which can cause mental derangement, hyperthyroidism, or even a nervous breakdown (perhaps brought on by the stress of his position). Whatever the cause, there was an obvious shift in his reign from this point on, leading his biographers to label him as insane.

Most of what history remembers of Caligula comes from Suetonius, in his book "Lives of the Twelve Caesars". According to Suetonius, Caligula once planned to appoint his favourite horse Incitatus to the Roman Senate. He ordered his soldiers to invade Britain to fight the Sea God Neptune, but changed his mind at the last minute and had them pick sea shells on the northern end of France instead. It is believed he carried on incestuous relations with his three sisters: Julia Livilla, Drusilla and Agrippina the Younger. He ordered a statue of himself to be erected in Herod's Temple at Jerusalem, which would have undoubtedly led to revolt had he not been dissuaded from this plan by his friend king Agrippa I. He ordered people to be secretly killed, and then called them to his palace. When they did not appear, he would jokingly remark that they must have committed suicide.

In 41, Caligula was assassinated by the commander of the guard Cassius Chaerea. Also killed were his fourth wife Caesonia and their daughter Julia Drusilla. For two days following his assassination, the senate debated the merits of restoring the Republic.

Claudius was a younger brother of Germanicus, and had long been considered a weakling and a fool by the rest of his family. The Praetorian Guard, however, acclaimed him as emperor. Claudius was neither paranoid like his uncle Tiberius, nor insane like his nephew Caligula, and was therefore able to administer the Empire with reasonable ability. He improved the bureaucracy and streamlined the citizenship and senatorial rolls. He ordered the construction of a winter port at Ostia Antica for Rome, thereby providing a place for grain from other parts of the Empire to be brought in inclement weather.

Claudius ordered the suspension of further attacks across the Rhine, setting what was to become the permanent limit of the Empire's expansion in that direction. In 43, he resumed the Roman conquest of Britannia that Julius Caesar had begun in the 50s BC, and incorporated more Eastern provinces into the empire.

In his own family life, Claudius was less successful. His wife Messalina cuckolded him; when he found out, he had her executed and married his niece, Agrippina the Younger. She, along with several of his freedmen, held an inordinate amount of power over him, and although there are conflicting accounts about his death, she may very well have poisoned him in 54. Claudius was deified later that year. The death of Claudius paved the way for Agrippina's own son, the 17-year-old Lucius Domitius Nero.

Nero ruled from 54 to 68. During his rule, Nero focused much of his attention on diplomacy, trade, and increasing the cultural capital of the empire. He ordered the building of theatres and promoted athletic games. His reign included the Roman–Parthian War (a successful war and negotiated peace with the Parthian Empire (58–63) ), the suppression of a revolt led by Boudica in Britannia (60–61) and the improvement of cultural ties with Greece. However, he was egotistical and had severe troubles with his mother, who he felt was controlling and over-bearing. After several attempts to kill her, he finally had her stabbed to death. He believed himself a god and decided to build an opulent palace for himself. The so-called Domus Aurea, meaning golden house in Latin, was constructed atop the burnt remains of Rome after the Great Fire of Rome (64). Because of the convenience of this many believe that Nero was ultimately responsible for the fire, spawning the legend of him fiddling while Rome burned which is almost certainly untrue. The Domus Aurea was a colossal feat of construction that covered a huge space and demanded new methods of construction in order to hold up the gold, jewel encrusted ceilings. By this time Nero was hugely unpopular despite his attempts to blame the Christians for most of his regime's problems.

A military coup drove Nero into hiding. Facing execution at the hands of the Roman Senate, he reportedly committed suicide in 68. According to Cassius Dio, Nero's last words were "Jupiter, what an artist perishes in me!"

Since he had no heir, Nero's suicide was followed by a brief period of civil war, known as the "Year of the Four Emperors". Between and, Rome witnessed the successive rise and fall of Galba, Otho and Vitellius until the final accession of Vespasian, first ruler of the Flavian dynasty. The military and political anarchy created by this civil war had serious implications, such as the outbreak of the Batavian rebellion. These events showed that a military power alone could create an emperor. Augustus had established a standing army, where individual soldiers served under the same military governors over an extended period of time. The consequence was that the soldiers in the provinces developed a degree of loyalty to their commanders, which they did not have for the emperor. Thus the Empire was, in a sense, a union of inchoate principalities, which could have disintegrated at any time.

Through his sound fiscal policy, the emperor Vespasian was able to build up a surplus in the treasury, and began construction on the Colosseum. Titus, Vespasian's successor, quickly proved his merit, although his short reign was marked by disaster, including the eruption of Mount Vesuvius in Pompeii. He held the opening ceremonies in the still unfinished Colosseum, but died in 81. His brother Domitian succeeded him. Having exceedingly poor relations with the Senate, Domitian was murdered in September 96.

The Flavians, although a relatively short-lived dynasty, helped restore stability to an empire on its knees. Although all three have been criticised, especially based on their more centralised style of rule, they issued reforms that created a stable enough empire to last well into the 3rd century. However, their background as a military dynasty led to further marginalisation of the senate, and a conclusive move away from "princeps", or first citizen, and toward "imperator", or emperor.

Vespasian was a remarkably successful Roman general who had been given rule over much of the eastern part of the Roman Empire. He had supported the imperial claims of Galba, after whose death Vespasian became a major contender for the throne. Following the suicide of Otho, Vespasian was able to take control of Rome's winter grain supply in Egypt, placing him in a good position to defeat his remaining rival, Vitellius. On December 20, 69, some of Vespasian's partisans were able to occupy Rome. Vitellius was murdered by his own troops and, the next day, Vespasian, then sixty years old, was confirmed as Emperor by the Senate.

Although Vespasian was considered an autocrat by the Senate, he mostly continued the weakening of that body begun in the reign of Tiberius. The degree of the Senate's subservience can be seen from the post-dating of his accession to power, by the Senate, to July 1, when his troops proclaimed him emperor, instead of December 21, when the Senate confirmed his appointment. Another example was his assumption of the censorship in 73, giving him power over the make up of the Senate. He used that power to expel dissident senators. At the same time, he increased the number of senators from 200 (at that low level because of the actions of Nero and the year of crisis that followed), to 1,000; most of the new senators came not from Rome but from Italy and the urban centres within the western provinces.

Vespasian was able to liberate Rome from the financial burdens placed upon it by Nero's excesses and the civil wars. To do this, he not only increased taxes, but created new forms of taxation. Also, through his power as censor, he was able to carefully examine the fiscal status of every city and province, many paying taxes based upon information and structures more than a century old. Through this sound fiscal policy, he was able to build up a surplus in the treasury and embark on public works projects. It was he who first commissioned the "Amphitheatrum Flavium" (Colosseum); he also built a forum whose centrepiece was a temple to Peace. In addition, he allotted sizeable subsidies to the arts, and created a chair of rhetoric at Rome.

Vespasian was also an effective emperor for the provinces, having posts all across the empire, both east and west. In the west he gave considerable favouritism to Hispania (the Iberian Peninsula, comprising modern Spain and Portugal) in which he granted Latin Rights to over three hundred towns and cities, promoting a new era of urbanisation throughout the western (formerly barbarian) provinces. Through the additions he made to the Senate he allowed greater influence of the provinces in the Senate, helping to promote unity in the empire. He also extended the borders of the empire, mostly done to help strengthen the frontier defenses, one of Vespasian's main goals.

The crisis of 69 had wrought havoc on the army. One of the most marked problems had been the support lent by provincial legions to men who supposedly represented the best will of their province. This was mostly caused by the placement of native auxiliary units in the areas they were recruited in, a practice Vespasian stopped; he mixed auxiliary units with men from other areas of the empire or moved the units away from where they were recruited. Also, to reduce further the chances of another military coup, he broke up the legions and, instead of placing them in singular concentrations, spread them along the border. Perhaps the most important military reform he undertook was the extension of legion recruitment from exclusively Italy to Gaul and Hispania, in line with the Romanisation of those areas.

Titus, the eldest son of Vespasian, had been groomed to rule. He had served as an effective general under his father, helping to secure the east and eventually taking over the command of Roman armies in Syria and Iudaea, quelling a significant Jewish revolt at the time. He shared the consulship for several years with his father and received the best tutelage. Although there was some trepidation when he took office because of his known dealings with some of the less respectable elements of Roman society, he quickly proved his merit, even recalling many exiled by his father as a show of good faith.

However, his short reign was marked by disaster: in 79, Mount Vesuvius erupted in Pompeii, and in 80, a fire destroyed much of Rome. His generosity in rebuilding after these tragedies made him very popular. Titus was very proud of his work on the vast amphitheater begun by his father. He held the opening ceremonies in the still unfinished edifice during the year 80, celebrating with a lavish show that featured 100 gladiators and lasted 100 days. Titus died in 81 at the age of 41 of what is presumed to be illness; it was rumoured that his brother Domitian murdered him in order to become his successor, although these claims have little merit. Whatever the case, he was greatly mourned and missed.

All of the Flavians had rather poor relations with the Senate due to their autocratic rule; however, Domitian was the only one who encountered significant problems. His continuous control as consul and censor throughout his rule—the former his father shared in much the same way as his Julio-Claudian forerunners, the latter presented difficulty even to obtain—were unheard of. In addition, he often appeared in full military regalia as an imperator, an affront to the idea of what the Principate-era emperor's power was based upon: the emperor as the princeps. His reputation in the Senate aside, he kept the people of Rome happy through various measures, including donations to every resident of Rome, wild spectacles in the newly finished Colosseum, and the continuation of the public works projects of his father and brother. He also apparently had the good fiscal sense of his father; although he spent lavishly, his successors came to power with a well-endowed treasury.

Toward the end of his reign Domitian became extremely paranoid, which probably had its roots in the treatment he received by his father: although given significant responsibility, he was never trusted with anything important without supervision. This flowered into the severe and perhaps pathological repercussions following the short-lived rebellion in 89 of Lucius Antonius Saturninus, a governor and commander in Germania Superior. Domitian's paranoia led to a large number of arrests, executions, and seizures of property (which might help explain his ability to spend so lavishly). Eventually it reached the point where even his closest advisers and family members lived in fear. This led to his murder in 96, orchestrated by his enemies in the Senate, Stephanus (the steward of the deceased Julia Flavia), members of the Praetorian Guard and the empress Domitia Longina.

The next century came to be known as the period of the "Five Good Emperors", in which the succession was peaceful and the Empire prosperous. The emperors of this period were Nerva (96–98), Trajan (98–117), Hadrian (117–138), Antoninus Pius (138–161) and Marcus Aurelius (161–180), each one adopted by his predecessor as his successor during the former's lifetime. While their respective choices of successor were based upon the merits of the individual men they selected rather than dynastic, it has been argued that the real reason for the lasting success of the adoptive scheme of succession lay more with the fact that none but the last had a natural heir.

The last 2 of the "Five Good Emperors" and Commodus are also called Antonines.

After his accession, Nerva set a new tone: he released those imprisoned for treason, banned future prosecutions for treason, restored much confiscated property, and involved the Roman Senate in his rule. He probably did so as a means to remain relatively popular and therefore alive, but this did not completely aid him. Support for Domitian in the army remained strong, and in October 97 the Praetorian Guard laid siege to the Imperial Palace on the Palatine Hill and took Nerva hostage. He was forced to submit to their demands, agreeing to hand over those responsible for Domitian's death and even giving a speech thanking the rebellious Praetorians. Nerva then adopted Trajan, a commander of the armies on the German frontier, as his successor shortly thereafter in order to bolster his own rule. Casperius Aelianus, the Guard Prefect responsible for the mutiny against Nerva, was later executed under Trajan.

Upon his accession to the throne, Trajan prepared and launched a carefully planned military campaign in Dacia, a region north of the lower Danube that had long been an opponent to Rome. In 101, Trajan personally crossed the Danube and defeated the armies of the Dacian king Decebalus at Tapae. The emperor decided not to press on towards a final conquest as his armies needed reorganisation, but he did impose very hard peace conditions on the Dacians. At Rome, Trajan was received as a hero and he took the name of "Dacicus", a title that appears on his coinage of this period. Decebalus complied with the terms for a time, but before long he began inciting revolt. In 105 Trajan once again invaded and after a yearlong campaign ultimately defeated the Dacians by conquering their capital, Sarmizegetusa Regia. King Decebalus, cornered by the Roman cavalry, eventually committed suicide rather than being captured and humiliated in Rome. The conquest of Dacia was a major accomplishment for Trajan, who ordered 123 days of celebration throughout the empire. He also constructed Trajan's column in Rome to glorify the victory.

In 112, Trajan was provoked by the decision of Osroes I of Parthia to put his own nephew Axidares on the throne of the Kingdom of Armenia. The Arsacid Dynasty of Armenia was a branch of the Parthian royal family, established in 54. Since then, the two great empires had shared hegemony of Armenia. The encroachment on the traditional Roman sphere of influence by Osroes ended the peace which had lasted for some 50 years.

Trajan marched first on Armenia. He deposed the king and annexed it to the Roman Empire. Then he turned south into Parthia itself, taking the cities of Babylon, Seleucia and finally the capital of Ctesiphon in 116, while suppressing a Jewish uprising across the region. He continued southward to the Persian Gulf, whence he declared Mesopotamia a new province of the empire and lamented that he was too old to follow in the steps of Alexander the Great and continue his march eastward.

But he did not stop there. In 116, he captured the great city of Susa. He deposed the Osroes I and put his own puppet ruler Parthamaspates on the throne. Never again would the Roman Empire advance so far to the east. During his rule, the Roman Empire reached its greatest extent; it was quite possible for a Roman to travel from Britain to the Persian Gulf without leaving Roman territory.

Despite his own excellence as a military administrator, Hadrian's reign was marked more by the defense of the empire's vast territories, rather than major military conflicts. He surrendered Trajan's conquests in Mesopotamia, considering them to be indefensible. There was almost a war with Vologases III of Parthia around 121, but the threat was averted when Hadrian succeeded in negotiating a peace. Hadrian's army crushed the Bar Kokhba revolt, a massive Jewish uprising in Judea (132–135).

Hadrian was the first emperor to extensively tour the provinces, donating money for local construction projects as he went. In Britain, he ordered the construction of a wall, the famous Hadrian's Wall as well as various other such defences in Germania and Northern Africa. His domestic policy was one of relative peace and prosperity.

Antoninus Pius's reign was comparatively peaceful; there were several military disturbances throughout the Empire in his time, in Mauretania, Judaea, and amongst the Brigantes in Britain, but none of them are considered serious. The unrest in Britain is believed to have led to the construction of the Antonine Wall from the Firth of Forth to the Firth of Clyde, although it was soon abandoned.

Germanic tribes and other people launched many raids along the long north European border, particularly into Gaul and across the Danube—Germans, in turn, may have been under attack from more warlike tribes farther east, driving them into the empire. His campaigns against them are commemorated on the Column of Marcus Aurelius.

In Asia, a revitalised Parthian Empire renewed its assault. Marcus Aurelius sent his co-emperor Lucius Verus to command the legions in the East. Lucius was authoritative enough to command the full loyalty of the troops, but already powerful enough that he had little incentive to overthrow Marcus. The plan succeeded—Verus remained loyal until his death, while on campaign, in 169.

In 175, while on campaign in the northern Germany in the Marcomannic Wars, Marcus was forced to contend with a rebellion by Avidius Cassius, a general who had been an officer during the wars against Persia. Cassius proclaimed himself Roman Emperor and took the provinces of Egypt and Syria as his part of the empire. It is said that Cassius had revolted as he had heard word that Marcus was dead. After three months Cassius was assassinated and Marcus restored the eastern part of the empire.

In the last years of his life Marcus, a philosopher as well as an emperor, wrote his book of Stoic philosophy known as the "Meditations". The book has since been hailed as Marcus' great contribution to philosophy.

When Marcus died in 180 the throne passed to his son Commodus, who had been elevated to the rank of co-emperor in 177. This ended the succession plan of the previous four emperors where the emperor would adopt his successor, although Marcus was the first emperor since Vespasian to have a natural son that could succeed him, which probably was the reason he allowed the throne to pass to Commodus and not adopt a successor from outside his family.

It is possible that an alleged Roman embassy from "Daqin" that arrived in Eastern Han China in 166 via a Roman maritime route into the South China Sea, landing at Jiaozhou (northern Vietnam) and bearing gifts for the Emperor Huan of Han (r. 146–168), was sent by Marcus Aurelius, or his predecessor Antoninus Pius (the confusion stems from the transliteration of their names as "Andun", Chinese: 安敦). The embassy was perhaps simply a group of Roman merchants, not official diplomats. Other Roman embassies of the 3rd century supposedly visited China by sailing along the same maritime route. These were preceded by the appearance of Roman glasswares in Chinese tombs, the earliest piece found at Guangzhou (along the coast of the South China Sea) and dating to the 1st century BC. The earliest Roman coins found in China date to the 4th century AD and appear to have come by way of the Silk Road through Central Asia. However, Roman golden medallions from the reign of Antoninus Pius, and possibly his successor Marcus Aurelius, have been discovered at Óc Eo (in southern Vietnam), which was then part of the Kingdom of Funan near Chinese-controlled Jiaozhi (northern Vietnam) and the region where Chinese historical texts claim the Romans first landed before venturing further into China to conduct diplomacy. Furthermore, in his "Geography" (c. 150 AD), Ptolemy described the location of the Golden Chersonese, now known as the Malay Peninsula, and beyond this a trading port called Kattigara. Ferdinand von Richthofen assumed this as Hanoi, yet the Roman and Mediterranean artefacts found at Óc Eo suggest this location instead.

The period of the "Five Good Emperors" was brought to an end by the reign of Commodus from 180 to 192. Commodus was the son of Marcus Aurelius, making him the first direct successor in a century, breaking the scheme of adoptive successors that had worked so well. He was co-emperor with his father from 177. When he became sole emperor upon the death of his father in 180, it was at first seen as a hopeful sign by the people of the Roman Empire. Nevertheless, as generous and magnanimous as his father was, Commodus was just the opposite. In "The Decline and Fall of the Roman Empire" by Edward Gibbon, it is noted that Commodus at first ruled the empire well. However, after an assassination attempt, involving a conspiracy by certain members of his family, Commodus became paranoid and slipped into insanity. The Pax Romana, or "Roman Peace", ended with the reign of Commodus. One could argue that the assassination attempt began the long decline of the Roman Empire. When Commodus' behaviour became increasingly erratic throughout the early 190s, Pertinax is thought to have been implicated in the conspiracy that led to Commodus' assassination on 31 December 192. The plot was carried out by the Praetorian prefect Quintus Aemilius Laetus, Commodus' mistress Marcia, and his chamberlain Eclectus.

After the murder had been carried out, Pertinax, who was serving as urban prefect at this time, was hurried to the Praetorian Camp and proclaimed emperor the following morning. His short reign (86 days) was an uneasy one. He attempted to emulate the restrained practices of Marcus Aurelius, and made an effort to reform the welfare program for poor children but he faced antagonism from many quarters. His monetary reform was far-sighted, but would not survive his death. He attempted to impose stricter military discipline upon the pampered Praetorians. In early March he narrowly averted one conspiracy by a group to replace him with the consul Quintus Sosius Falco while he was in Ostia inspecting the arrangements for grain shipments. The plot was betrayed; Falco himself was pardoned but several of the officers behind the coup were executed. On 28 March 193, Pertinax was at his palace when, a contingent of some three hundred soldiers of the Praetorian Guard rushed the gates (two hundred according to Cassius Dio). Sources suggest that they had received only half their promised pay. Neither the guards on duty nor the palace officials chose to resist them. Pertinax sent Laetus to meet them, but he chose to side with the insurgents instead and deserted the emperor. Although advised to flee, he then attempted to reason with them, and was almost successful before being struck down by one of the soldiers. The Praetorian Guards auctioned off the imperial position, which Senator Didius Julianus won and became the new Emperor.

Upon his accession, Julianus immediately devalued the Roman currency by decreasing the silver purity of the denarius from 87% to 81.5%. After the initial confusion had subsided, the population did not tamely submit to the dishonor brought upon Rome. Whenever Julianus appeared in public he was saluted with groans, imprecations, and shouts of "robber and parricide." The mob tried to obstruct his progress to the Capitol, and even threw stones. When news of the public anger in Rome spread across the Empire, the generals Pescennius Niger in Syria, Septimius Severus in Pannonia, and Clodius Albinus in Britain, each having three legions under his command, refused to recognize the authority of Julianus. Julianus declared Severus a public enemy because he was the nearest of the three and, therefore, the most dangerous foe. Deputies were sent from the Senate to persuade the soldiers to abandon him; a new general was nominated to supersede him, and a centurion dispatched to take his life.

The Praetorian Guard, lacking discipline and sunk in debauchery and sloth, were incapable of offering any effectual resistance. Julianus, now desperate, attempted negotiation and offered to share the empire with his rival. Severus ignored these overtures and pressed forward, all Italy declaring for him as he advanced. At last the Praetorians, having received assurances that they would suffer no punishment – provided they surrendered the actual murderers of Pertinax – seized the ringleaders of the conspiracy and reported what they had done to Silius Messala, the consul, by whom the Senate was summoned and informed of the proceedings. Julianus was killed in the palace by a soldier in the third month of his reign (1 June 193). Severus dismissed the Praetorian Guard and executed the soldiers who had killed Pertinax. According to Cassius Dio, who lived in Rome during the period, Julianus's last words were "But what evil have I done? Whom have I killed?" His body was given to his wife and daughter, who buried it in his great-grandfather's tomb by the fifth milestone on the Via Labicana.

Lucius Septimius Severus was born to a family of Phoenician equestrian rank in the Roman province of Africa proconsularis. He rose through military service to consular rank under the later Antonines. Proclaimed emperor in 193 by his legionaries in Noricum during the political unrest that followed the death of Commodus, he secured sole rule over the empire in 197 after defeating his last rival, Clodius Albinus, at the Battle of Lugdunum. In securing his position as emperor, he founded the Severan dynasty.

Severus fought a successful war against the Parthians and campaigned with success against barbarian incursions in Roman Britain, rebuilding Hadrian's Wall. In Rome, his relations with the Senate were poor, but he was popular with the commoners, as with his soldiers, whose salary he raised. Starting in 197, the influence of his Praetorian prefect Gaius Fulvius Plautianus was a negative influence; the latter was executed in 205. One of Plautianus's successors was the jurist Aemilius Papinianus. Severus continued official persecution of Christians and Jews, as they were the only two groups who would not assimilate their beliefs to the official syncretistic creed. Severus died while campaigning in Britain. He was succeeded by his sons Caracalla and Geta, who reigned under the influence of their mother, Julia Domna.

The eldest son of Severus, Caracalla was born Lucius Septimius Bassianus in Lugdunum, Gaul. "Caracalla" was a nickname referring to the Gallic hooded tunic he habitually wore even when he slept. Upon his father's death, Caracalla was proclaimed co-emperor with his brother Geta. Conflict between the two culminated in the assassination of the latter.

Reigning alone, Caracalla was noted for lavish bribes to the legionaries and unprecedented cruelty, authorizing numerous assassinations of perceived enemies and rivals. He campaigned with indifferent success against the Alamanni. The Baths of Caracalla in Rome are the most enduring monument of his rule. His reign was also notable for the Antonine Constitution (Latin: "Constitutio Antoniniana"), also known as the "Edict of Caracalla", which granted Roman citizenship to nearly all freemen throughout the Roman Empire.

He was assassinated while en route to a campaign against the Parthians by the Praetorian Guard.

The younger son of Severus, Geta was made co-emperor with his older brother Caracalla upon his father's death. Unlike the much more successful joint reign of Marcus Aurelius and his brother Lucius Verus in the previous century, relations were hostile between the two Severid brothers from childhood. Geta was assassinated in his mother's apartments by order of Caracalla, who thereafter ruled as sole Augustus.

M.M. Opelius Macrinus was born in 164 at Caesarea. Although coming from a humble background that was "not" dynastically related to the Severan dynasty, he rose through the imperial household until, under the emperor Caracalla, he was made Prefect of the Praetorian Guard. On account of the cruelty and treachery of the emperor, Macrinus became involved in a conspiracy to kill him, and ordered the Praetorian Guard to do so. On April 8, 217, Caracalla was assassinated traveling to Carrhae. Three days later, Macrinus was declared Augustus.

His most significant early decision was to make peace with the Parthians, but many thought that the terms were degrading to the Romans. However, his downfall was his refusal to award the pay and privileges promised to the eastern troops by Caracalla. He also kept those forces wintered in Syria, where they became attracted to the young Elagabalus. After months of mild rebellion by the bulk of the army in Syria, Macrinus took his loyal troops to meet the army of Elagabalus near Antioch. Despite a good fight by the Praetorian Guard, his soldiers were defeated. Macrinus managed to escape to Chalcedon but his authority was lost: he was betrayed and executed after a short reign of just 14 months. M. Opelius Diadumenianus was the son of Macrinus, born in 208. He was given the title Caesar in 217, when his father became Emperor. After his father's defeat outside Antioch, he tried to escape east to Parthia, but was captured and killed before he could achieve this.

Born Varius Avitus Bassianus on May 16, 205, known later as M. Aurelius Antonius, he was appointed at an early age to be priest of the sun God, Elagabalus, represented by a large, dark rock called a baetyl, by which name he is known to historians (his name is sometimes written "Heliogabalus"). He was proclaimed emperor by the troops of Emesa, his hometown, who were instigated to do so by Elagabalus's grandmother, Julia Maesa. She spread a rumor that Elagabalus was the secret son of Caracalla. This revolt spread to the entire Syrian army (which, at the time, was swollen with troops raised by the Emperor Caracalla, and not fully loyal to Macrinus), and eventually they were to win the short struggle that followed by defeating Macrinus at a battle just outside Antioch. Elagabalus was then accepted by the Senate, and he began the slow journey to Rome.

His reign in Rome has long been known for outrageousness, although the historical sources are few, and in many cases not to be fully trusted. He is said to have smothered guests at a banquet by flooding the room with rose petals; married his male lover – who was then referred as the 'Empress's husband'; and married one of the Vestal Virgins. Some say he was transgender, and one ancient text states that he offered half the empire to the physician who could give him female genitalia.

The running of the Empire during this time was mainly left to his grandmother and mother (Julia Soamias). Seeing that her grandson's outrageous behavior could mean the loss of power, Julia Maesa persuaded Elagabalus to accept his cousin Alexander Severus as Caesar (and thus the nominal Emperor-to-be). However, Alexander was popular with the troops, who viewed their new Emperor with dislike: when Elagabalus, jealous of this popularity, removed the title of Caesar from his nephew, the enraged Praetorian Guard swore to protect him. Elagabalus and his mother were murdered in a Praetorian Guard camp mutiny.

Born Marcus Julius Gessius Bassianus Alexianus, Alexander was adopted as heir apparent by his slightly older and very unpopular cousin, the Emperor Elagabalus at the urging of the influential and powerful Julia Maesa — who was grandmother of both cousins and who had arranged for the emperor's acclamation by the Third Legion. On March 6, 222, when Alexander was just fourteen, a rumor went around the city troops that Alexander had been killed, triggering a revolt of the guards that had sworn his safety from Elegabalus and his ascension as emperor. The eighteen-year-old Emperor Elagabalus and his mother were both taken from the palace, dragged through the streets, murdered and thrown in the river Tiber by the Praetorian Guard, who then proclaimed Alexander Severus as Augustus.

Ruling from the age of fourteen under the influence of his able mother, Julia Avita Mamaea, Alexander restored, to some extent, the moderation that characterized the rule of Septimius Severus. The rising strength of the Sasanian Empire (226–651) heralded perhaps the greatest external challenge that Rome faced in the 3rd century. His prosecution of the war against a German invasion of Gaul led to his overthrow by the troops he was leading, whose regard the twenty-seven-year-old had lost during the campaign.

The situation of the Roman Empire became dire in AD 235, when the emperor Alexander Severus was murdered by his own troops. Many Roman legions had been defeated during a campaign against Germanic peoples raiding across the borders, while the emperor was focused primarily on the dangers from the Sassanid Persian Empire. Leading his troops personally, Alexander Severus resorted to diplomacy and the paying of tribute in an attempt to pacify the Germanic chieftains quickly. According to Herodian this cost him the respect of his troops, who may have felt they should be punishing the tribes who were intruding on Rome's territory.

In the years following the emperor's death, generals of the Roman army fought each other for control of the Empire and neglected their duties in preventing invasions. Provincials became victims of frequent raids by foreign tribes, such as the Carpians, Goths, Vandals, and Alamanni, along the Rhine and Danube Rivers in the western part of the Empire, as well as attacks from Sassanids in the eastern part of the Empire. Additionally, in 251, the Plague of Cyprian (possibly smallpox) broke out, causing large-scale mortality which may have seriously affected the ability of the Empire to defend itself.

By 258, the Roman Empire broke up into three competing states. The Roman provinces of Gaul, Britain and Hispania broke off to form the Gallic Empire and, two years later in 260, the eastern provinces of Syria, Palestine and Aegyptus became independent as the Palmyrene Empire, leaving the remaining Italian-centered Roman Empire-proper in the middle.

An invasion by a vast host of Goths was beaten back at the Battle of Naissus in 269. This victory was significant as the turning point of the crisis, when a series of tough, energetic soldier-emperors took power. Victories by the emperor Claudius II Gothicus over the next two years drove back the Alamanni and recovered Hispania from the Gallic Empire. When Claudius died in 270 of the plague, Aurelian, who had commanded the cavalry at Naissus, succeeded him as the emperor and continued the restoration of the Empire.

Aurelian reigned (270–275) through the worst of the crisis, defeating the Vandals, the Visigoths, the Palmyrenes, the Persians, and then the remainder of the Gallic Empire. By late 274, the Roman Empire was reunited into a single entity, and the frontier troops were back in place. More than a century would pass before Rome again lost military ascendancy over its external enemies. However, dozens of formerly thriving cities, especially in the Western Empire, had been ruined, their populations dispersed and, with the breakdown of the economic system, could not be rebuilt. Major cities and towns, even Rome itself, had not needed fortifications for many centuries; many then surrounded themselves with thick walls.

Finally, although Aurelian had played a significant role in restoring the Empire's borders from external threat, more fundamental problems remained. In particular, the right of succession had never been clearly defined in the Roman Empire, leading to continuous civil wars as competing factions in the military, Senate and other parties put forward their favored candidate for emperor. Another issue was the sheer size of the Empire, which made it difficult for a single autocratic ruler to effectively manage multiple threats at the same time. These continuing problems would be radically addressed by Diocletian, allowing the Empire to continue to survive in the West for over a century and in the East for over a millennium.

As a matter of historical convention, the late Roman Empire emerged from the Roman Principate (the early Roman Empire), with the accession of Diocletian in 284, his reign marking the beginning of the Dominate, or Late Roman Empire. It may begin with the commencement of the reign of Diocletian in AD 284, following the Third Century Crisis of AD 235–284, and to end in the west with the collapse of the Western Empire in AD 476, while in the east its end is disputed, as either occurring at the close of the reign of Justinian I (AD 565) or of Heraclius (AD 641).

The transition from a single united empire to the later divided Western and Eastern empires was a gradual transformation. In July 285, Diocletian defeated rival Emperor Carinus and briefly became sole emperor of the Roman Empire. Diocletian's reign stabilized the empire and marked the end of the Crisis of the Third Century. Diocletian appointed a co-emperor in 286 and delegated further with two junior-emperors.

Diocletian secured the empire's borders and purged it of all threats to his power. He defeated the Sarmatians and Carpi during several campaigns between 285 and 299, the Alamanni in 288, and usurpers in Egypt between 297 and 298. Galerius, aided by Diocletian, campaigned successfully against Sassanid Persia, the empire's traditional enemy. In 299 he sacked their capital, Ctesiphon. Diocletian led the subsequent negotiations and achieved a lasting and favorable peace. Diocletian separated and enlarged the empire's civil and military services and reorganized the empire's provincial divisions, establishing the largest and most bureaucratic government in the history of the empire. He established new administrative centers in Nicomedia, Mediolanum, Antioch, and Trier, closer to the empire's frontiers than the traditional capital at Rome had been. Building on third-century trends towards absolutism, he styled himself an autocrat, elevating himself above the empire's masses with imposing forms of court ceremonies and architecture. Bureaucratic and military growth, constant campaigning, and construction projects increased the state's expenditures and necessitated a comprehensive tax reform. From at least 297 on, imperial taxation was standardized, made more equitable, and levied at generally higher rates.

Diocletian saw that the vast Roman Empire was ungovernable by a single emperor in the face of internal pressures and military threats on two fronts. He therefore split the Empire in half along a northwest axis just east of Italy, and created two equal Emperors to rule under the title of "Augustus". Diocletian himself was the "Augustus" of the eastern half, and he made his long-time friend Maximian "Augustus" of the western half. In doing so, he effectively created what would become the Western Roman Empire and the Eastern Roman Empire.

On March 1 293, authority was further divided. Each "Augustus" took a junior Emperor called a "Caesar" to aid him in administrative matters, and to provide a line of succession. Galerius became "Caesar" for Diocletian and Constantius Chlorus "Caesar" for Maximian. This constituted what is called the Tetrarchy (in Greek: "leadership of four") by modern scholars, as each emperor would rule over a quarter-division of the empire. After Rome had been plagued by bloody disputes about the supreme authority, this finally formalised a peaceful succession of the emperor: in each half a "Caesar" would rise up to replace the "Augustus" and select a new "Caesar". On May 1, 305, Diocletian and Maximian abdicated in favour of their "Caesars". Galerius named the two new "Caesars": his nephew Maximinus for himself, and Flavius Valerius Severus for Constantius. The arrangement worked well under Diocletian and Maximian and shortly thereafter. The internal tensions within the Roman government were less acute than they had been. In "The Decline and Fall of the Roman Empire", Edward Gibbon notes that this arrangement worked well because of the affinity the four rulers had for each other. Gibbon says that this arrangement has been compared to a "chorus of music". With the withdrawal of Diocletian and Maximian, this harmony disappeared.

After an initial period of tolerance, Diocletian, who was a fervent pagan and was worried about the ever-increasing numbers of Christians in the Empire, persecuted them with zeal unknown since the time of Nero; this was to be one of the greatest persecutions the Christians endured in history. Not all of Diocletian's plans were successful: the "Edict on Maximum Prices" (301), his attempt to curb inflation via price controls, was counterproductive and quickly ignored. Although effective while he ruled, Diocletian's tetrarchic system collapsed after his abdication under the competing dynastic claims of Maxentius and Constantine, sons of Maximian and Constantius respectively. The Diocletianic Persecution (303–11), the empire's last, largest, and bloodiest official persecution of Christianity, did not destroy the empire's Christian community; indeed, after 324 Christianity became the empire's preferred religion under its first Christian emperor, Constantine.

In spite of his failures, Diocletian's reforms fundamentally changed the structure of Roman imperial government and helped stabilize the empire economically and militarily, enabling the empire to remain essentially intact for another hundred years despite being near the brink of collapse in Diocletian's youth. Weakened by illness, Diocletian left the imperial office on 1 May 305, and became the first Roman emperor to voluntarily abdicate the position (John VI retired to a monastery in the 14th century). He lived out his retirement in his palace on the Dalmatian coast, tending to his vegetable gardens. His palace eventually became the core of the modern-day city of Split.

The Tetrarchy would effectively collapse with the death of Constantius Chlorus on July 25, 306. Constantius's troops in Eboracum immediately proclaimed his son Constantine the Great as "Augustus". In August 306, Galerius promoted Severus to the position of "Augustus". A revolt in Rome supported another claimant to the same title: Maxentius, son of Maximian, who was proclaimed "Augustus" on October 28, 306. His election was supported by the Praetorian Guard. This left the Empire with five rulers: four "Augusti" (Galerius, Constantine, Severus and Maxentius) and one "Caesar" (Maximinus).

The year 307 saw the return of Maximian to the rank of "Augustus" alongside his son Maxentius, creating a total of six rulers of the Empire. Galerius and Severus campaigned against them in Italy. Severus was killed under command of Maxentius on September 16, 307. The two "Augusti" of Italy also managed to ally themselves with Constantine by having Constantine marry Fausta, the daughter of Maximian and sister of Maxentius. At the end of 307, the Empire had four "Augusti" (Maximian, Galerius, Constantine and Maxentius) and a sole "Caesar".

In 311 Galerius officially put an end to the persecution of Christians, and Constantine legalised Christianity definitively in 313 as evidenced in the so-called "Edict of Milan". Constantine defeated his brother-in-law Licinius in 324, unifying the Empire under his control. He would rule until his death on 22 May 337.

The Empire was parted again among his three surviving sons. The Western Roman Empire was divided among the eldest son Constantine II and the youngest son Constans. The Eastern Roman Empire along with Constantinople were the share of middle son Constantius II.

Constantine II was killed in conflict with his youngest brother in 340. Constans was himself killed in conflict with the army-proclaimed Augustus Magnentius on January 18, 350. Magnentius was at first opposed in the city of Rome by self-proclaimed Augustus Nepotianus, a paternal first cousin of Constans. Nepotianus was killed alongside his mother Eutropia. His other first cousin Constantia convinced Vetriano to proclaim himself Caesar in opposition to Magnentius. Vetriano served a brief term from March 1 to December 25, 350. He was then forced to abdicate by the legitimate Augustus Constantius. The usurper Magnentius would continue to rule the Western Roman Empire until 353 while in conflict with Constantius. His eventual defeat and suicide left Constantius as sole Emperor.

Constantius's rule would however be opposed again in 360. He had named his paternal half-cousin and brother-in-law Julian as his Caesar of the Western Roman Empire in 355. During the following five years, Julian had a series of victories against invading Germanic tribes, including the Alamanni. This allowed him to secure the Rhine frontier. His victorious Gallic troops thus ceased campaigning. Constantius sent orders for the troops to be transferred to the east as reinforcements for his own currently unsuccessful campaign against Shapur II of Persia. This order led the Gallic troops to an insurrection. They proclaimed their commanding officer Julian to be an Augustus. Both Augusti readied their troops for another Roman Civil War, but the timely demise of Constantius on 3 November 361 prevented this war from occurring.

Julian would serve as the sole Emperor for two years. He had been raised by the Gothic slave Mardonius, a great admirer of ancient Greek philosophy and literature. Julian had received his baptism as a Christian years before, but no longer considered himself one. His reign would see the ending of restrictions and violence against paganism introduced by his uncle and father-in-law Constantine I and his cousins and brothers-in-law Constantine II, Constans and Constantius II. He instead placed similar restrictions on Christianity, and some unofficial violence against Christians occurred. His edict of toleration in 362 ordered the reopening of pagan temples and the reinstitution of alienated temple properties, and, more problematically for the Christian Church, the recalling of previously exiled Christian bishops. Returning Orthodox and Arian bishops resumed their conflicts, thus further weakening the Church as a whole.

Julian himself was not a traditional pagan. His personal beliefs were largely influenced by Neoplatonism and Theurgy; he reputedly believed he was the reincarnation of Alexander the Great. He produced works of philosophy arguing his beliefs. His brief renaissance of paganism would, however, end with his death. Julian eventually resumed the war against Shapur II of Persia. He received a mortal wound in battle and died on June 26, 363. According to Gibbon in "The Decline and Fall of the Roman Empire", upon being mortally wounded by a dart, he was carried back to his camp. He gave a farewell speech, in which he refused to name a successor. He then proceeded to debate the philosophical nature of the soul with his generals. He then requested water and, shortly after drinking it, died. He was considered a hero by pagan sources of his time and a villain by Christian ones. Gibbon wrote quite favourably about Julian. Contemporary historians have treated him as a controversial figure.

Julian died childless and with no designated successor. The officers of his army elected the rather obscure officer Jovian emperor. He is remembered for signing an unfavourable peace treaty with Persia, ceding territories won from the Persians, dating back to Trajan. He restored the privileges of Christianity. He is considered a Christian himself, though little is known of his beliefs. Jovian himself died on February 17, 364.

The role of choosing a new Augustus fell again to army officers. On February 28, 364, Pannonian officer Valentinian I was elected Augustus in Nicaea, Bithynia. The army had been left leaderless twice in less than a year, and the officers demanded Valentinian choose a co-ruler. On March 28 Valentinian chose his own younger brother Valens and the two new Augusti parted the Empire in the pattern established by Diocletian: Valentinian would administer the Western Roman Empire, while Valens took control over the Eastern Roman Empire.

The election of Valens was soon disputed. Procopius, a Cilician maternal cousin of Julian, had been considered a likely heir to his cousin but was never designated as such. He had been in hiding since the election of Jovian. In 365, while Valentinian was at Paris and then at Rheims to direct the operations of his generals against the Alamanni, Procopius managed to bribe two legions assigned to Constantinople and take control of the Eastern Roman capital. He was proclaimed Augustus on September 28 and soon extended his control to both Thrace and Bithynia. War between the two rival Eastern Roman Emperors continued until Procopius was defeated. Valens had him executed on May 27, 366.

On August 4, 367, the eight-year-old Gratian was proclaimed as a third Augustus by his father Valentinian and uncle Valens, a nominal co-ruler and means to secure succession.

In April 375 Valentinian I led his army in a campaign against the Quadi, a Germanic tribe which had invaded his native province of Pannonia. During an audience with an embassy from the Quadi at Brigetio on the Danube, Valentinian suffered a burst blood vessel his brain while angrily yelling at the people gathered, resulting in his death on November 17, 375.

Succession did not go as planned. Gratian was then a 16-year-old and arguably ready to act as Emperor, but the troops in Pannonia proclaimed his infant half-brother emperor under the title Valentinian II.

Gratian acquiesced in their choice and administered the Gallic part of the Western Roman Empire. Italy, Illyria and Africa were officially administrated by his brother and his stepmother Justina. However the division was merely nominal as the actual authority still rested with Gratian.

Meanwhile, the Eastern Roman Empire faced its own problems with Germanic tribes. The Thervingi, an East Germanic tribe, fled their former lands following an invasion by the Huns. Their leaders Alavivus and Fritigern led them to seek refuge in the Eastern Roman Empire. Valens allowed them to settle as foederati on the southern bank of the Danube in 376. However, the newcomers faced problems from allegedly corrupted provincial commanders and a series of hardships. Their dissatisfaction led them to revolt against their Roman hosts.

Conflicts continued for the following two years. Valens led a campaign against them in 378. Gratian provided his uncle with reinforcements from the Western Roman army. However, this campaign proved disastrous for the Romans. The two armies approached each other near Adrianople. Valens was apparently overconfident of the numerical superiority of his own forces over the Goths. Some of his officers advised caution and to await the arrival of Gratian, others urged an immediate attack and eventually prevailed over Valens, who, eager to have all of the glory for himself, rushed into battle. On August 9, 378, the Battle of Adrianople resulted in the crushing defeat of the Romans and the death of Valens. Contemporary historian Ammianus Marcellinus estimated that two-thirds of the Roman army were lost in the battle.

The battle had far-reaching consequences. Veteran soldiers and valuable administrators were among the heavy casualties. There were few available replacements at the time, leaving the Empire with the problem of finding suitable leadership. The Roman army also started to face recruiting problems. In the following century much of the Roman army would consist of Germanic mercenaries.

For the moment, however, there was another concern. The death of Valens left Gratian and Valentinian II as the sole Augusti. Gratian was now effectively responsible for the whole of the Empire. He sought a replacement Augustus for the Eastern Roman Empire. His choice was Theodosius I, son of formerly distinguished general Count Theodosius. The elder Theodosius had been executed in early 375 for unclear reasons. The younger was named Augustus of the Eastern Roman Empire on January 19, 379. His appointment would prove a deciding moment in the division of the Empire.

Gratian governed the Western Roman Empire with energy and success for some years, but he gradually sank into indolence. He is considered to have become a figurehead while Frankish general Merobaudes and bishop Ambrose of Milan jointly acted as the power behind the throne. Gratian lost favor with factions of the Roman Senate by prohibiting traditional paganism at Rome and relinquishing his title of Pontifex Maximus. The senior Augustus also became unpopular with his own Roman troops because of his close association with so-called barbarians. He reportedly recruited Alans to his personal service and adopted the guise of a Scythian warrior for public appearances.

Meanwhile, Gratian, Valentinian II and Theodosius were joined by a fourth Augustus. Theodosius proclaimed his oldest son Arcadius an Augustus in January 383 in an obvious attempt to secure succession. The boy was still only five or six years old and held no actual authority. Nevertheless, he was recognised as a co-ruler by all three Augusti.

The increasing unpopularity of Gratian would cause the four Augusti problems later that same year. Magnus Maximus, a general from Hispania, stationed in Roman Britain, was proclaimed Augustus by his troops in 383 and, rebelling against Gratian, he invaded Gaul. Gratian fled from Lutetia (Paris) to Lugdunum (Lyon), where he was assassinated on August 25, 383, at the age of 25.

Maximus was a firm believer of the Nicene Creed and introduced state persecution on charges of heresy, which brought him into conflict with Pope Siricius who argued that the Augustus had no authority over church matters. But he was an Emperor with popular support, as is attested in Romano-British tradition, where he gained a place in the "Mabinogion", compiled about a thousand years after his death.

Following Gratian's death, Maximus had to deal with Valentinian II, at the time only twelve years old, as the senior Augustus. During the first few years, the Alps would serve as the borders between the respective territories of the two rival Western Roman Emperors. Maximus controlled Britain, Gaul, Hispania and Africa. He chose Augusta Treverorum (Trier) as his capital.

Maximus soon entered negotiations with Valentinian II and Theodosius, attempting to gain their official recognition. By 384, negotiations were unfruitful and Maximus tried to press the matter by settling succession as only a legitimate Emperor could do: proclaiming his own infant son Flavius Victor an Augustus. The end of the year found the Empire having five Augusti (Valentinian II, Theodosius I, Arcadius, Magnus Maximus and Flavius Victor) with relations between them yet to be determined.

Theodosius was left a widower in 385, following the sudden death of Aelia Flaccilla, his "Augusta". He was remarried, to the sister of Valentinean II, Galla, and the marriage secured closer relations between the two legitimate Augusti.

In 386 Maximus and Victor finally received official recognition by Theodosius but not by Valentinian. In 387, Maximus apparently decided to rid himself of his Italian rival. He crossed the Alps into the valley of the Po and threatened Milan. Valentinian and his mother fled to Thessaloniki from where they sought the support of Theodosius. Theodosius indeed campaigned west in 388 and was victorious against Maximus. Maximus himself was captured and executed in Aquileia on July 28, 388. Magister militum Arbogast was sent to Trier with orders to also kill Flavius Victor. Theodosius restored Valentinian to power and through his influence had him converted to Orthodox Catholicism. Theodosius continued supporting Valentinian and protecting him from a variety of usurpations.

In 392 Valentinian II was murdered in Vienne. Arbogast arranged for the appointment of Eugenius as emperor. However, the eastern emperor Theodosius refused to recognise Eugenius as emperor and invaded the West, defeating and killing Arbogast and Eugenius at the Battle of the Frigidus. He thus reunited the entire Roman Empire under his rule.

Theodosius had two sons and a daughter, Pulcheria, from his first wife, Aelia Flacilla. His daughter and wife died in 385. By his second wife, Galla, he had a daughter, Galla Placidia, the mother of Valentinian III, who would be Emperor of the West.

Theodosius was the last Emperor who ruled over the whole Empire. After his death in 395, he gave the two halves of the Empire to his two sons Arcadius and Honorius; Arcadius became ruler in the East, with his capital in Constantinople, and Honorius became ruler in the West, with his capital in Milan and later Ravenna. The Roman state would continue to have two different emperors with different seats of power throughout the 5th century, though the Eastern Romans considered themselves to be the only ones who were fully Roman. Latin was used in official writings as much as, if not more than, Greek and the two halves were nominally, culturally and historically, if not politically, the same state.

After 395, the emperors in the Western Roman Empire were usually figureheads, while the actual rulers were military strongmen who took the title of "magister militum", "patrician" or both—Stilicho from 395 to 408, Constantius from about 411 to 421, Aëtius from 433 to 454 and Ricimer from about 457 to 472. The year 476 is generally accepted as the formal end of the Western Roman Empire. That year, Orestes, having stolen power from the emperor Julius Nepos the year before, refused the request of Germanic mercenaries in his service for lands in Italy. The dissatisfied mercenaries, including the Heruli, revolted. The revolt was led by the Germanic chieftain Odoacer. Odoacer and his men captured and executed Orestes; weeks later they captured Ravenna and deposed Orestes' usurper son, Romulus Augustus. This event has been traditionally considered the fall of the Roman Empire in the West. Odoacer quickly conquered the remaining provinces of Italy.

Odoacer returned the western imperial regalia to the eastern emperor, Zeno. Zeno soon received two deputations. One was from Odoacer requesting that his control of Italy be formally recognised by the empire, in which case he would in turn acknowledge Zeno's supremacy. The other deputation was from Julius Nepos, requesting support to regain the throne. Zeno granted Odoacer the title Patrician. Zeno told Odoacer and the Roman Senate to take Nepos back; however, Nepos never returned from Dalmatia, even though Odoacer issued coins in his name. Upon Nepos's death in 480, Zeno claimed Dalmatia for the East; J. B. Bury considers this the real end of the Western Roman Empire. Odoacer attacked Dalmatia, and the ensuing war ended with Theodoric the Great, King of the Ostrogoths, conquering Italy under Zeno's authority.

Disunion in the Roman Empire further contributed to disunion in the Church. The Emperor Diocletian famously divided the administration of the eastern and western portions of the Empire in the early 4th century, though subsequent leaders (including Constantine) aspired to and sometimes gained control of both regions. Theodosius the Great, who established Nicene Christianity as the official religion of the Roman Empire (see Edict of Thessalonica), was the last Emperor to rule over a united Roman Empire. Following his death in 395, the division into western and eastern halves, each for a few decades still under its own Emperor, was never reunited.

History of the East–West Schism

History of the East–West Schism refers to history of the East–West Schism that occurred in 1054, representing one of the most significant events in the history of Christianity. It includes various events and processes that led to the Schism, and also those events and processes that occurred as a result of the Schism. Eastern and Western Christians had a history of differences and disagreements, some dating back even to the period of Early Christianity. At the very root of what later became the "Great Schism" were several questions of pneumatology and ecclesiology. The most important theological difference occurred over various questions regarding the procession of the Holy Spirit, and the use of the Filioque clause in the Creed. One of the main ecclesiological issues was the question of Papal supremacy. Other points of difference were related o various liturgical, mainly ritual and disciplinary customs and practices. Some political and cultural processes also contributed to the breakout of the Schism.

Eric Plumer writes that "(t)he divergence of the Eastern and Western churches, leading ultimately to the East-West Schism, was a process of many centuries, influenced by a host of political, cultural and theological factors. Similarly, Roger Haight asserts that, "The [East-West Schism] should not be understood to have occurred in the mutual excommunications [of 1054]" because those excommunications were "only one factor in a much longer and larger story involving cultural, political and theological factors." Because so many factors contributed to the ever-widening separation between East and West, it is difficult to point to a specific date when it began or even identify a single primary cause of the schism. While most sources agree that the separation between East and West is clearly evident by the Photian schism in the ninth century, some point to tensions going back as far as the fourth century as the early signs of the separation between East and West.
Orthodox apologists point to incidents as early as the 2nd century as examples of claims by Rome to papal primacy and rejection by Eastern Churches.

Some scholars have argued that the Schism between East and West has very ancient roots, and that sporadic schisms in the common unions took place under Pope Victor I (2nd century), Pope Stephen I (3rd century) and Pope Damasus I (4th and 5th century). Later on, disputes about theological and other questions led to schisms between the Churches in Rome and Constantinople for 37 years from 482 to 519 (the Acacian Schism), and for 13 years from 866-879 (see Patriarch Photios I of Constantinople).

The idea that with the transfer of the imperial capital from Rome to Constantinople primacy in the Church was also transferred is found in undeveloped form as early as John Philoponus (c. 490–c. 570); it was enunciated in its most advanced form by Photios I of Constantinople (c. 810–c. 893). Constantinople, as the seat of the ruler of the empire and therefore of the world, was the highest among the patriarchates and, like the emperor, had the right to govern them.

John Binns, a Director of the Institute of Orthodox Christian Studies at Cambridge University, specifically writes that, after the fall and destruction of Jerusalem by the Romans, the natural learning centers of the Church were Antioch and Alexandria.

Founding of the Church of Alexandria had been assisted by Mark, one of the Seventy Apostles. Antioch had attracted Peter and Paul and Barnabas, plus others of the thousands of apostles. Antioch was the base from which Paul made his missionary journeys to the pagans. The Church of Antioch sent the apostles Peter and Paul to Rome to assist the fledgling church there in its growth, and because Rome was the capital of the Roman Empire. Antioch regarded Peter as its first bishop.

Saint Thomas went east, and was said to be instrumental in establishing the Church in the Persian Empire and satellite kingdoms, although Saint Addai and Saint Mari, two of the Seventy Apostles were credited with most of the work of establishment in Persia itself. The Church of the East was as large as the Mediterranean Church for some centuries, especially in the 6th to 8th centuries with its highly successful movement into India, Mongolia, China, Tibet, Korea, and Japan.

Saint Andrew is credited with establishing the church in the Greek area of what became Byzantium and then Constantinople, some centuries later.
In the 4th century when the Roman emperors were trying to control the Church, theological questions were running rampant throughout the Roman Empire. The influence of Greek speculative thought on Christian thinking led to all sorts of divergent and conflicting opinions. Christ's commandment to love others as He loved, seemed to have been lost in the intellectual abstractions of the time. Theology was also used as a weapon against opponent bishops, since being branded a heretic was the only sure way for a bishop to be removed by other bishops. Incompetence was not sufficient grounds for removal.
Over the course of history, tensions have arisen when church leaders have been perceived to have overstepped their bounds.

The first institution to fail in the early Christian Empire was politics. In the 5th century, western imperial power fell prior to the invasion of the Barbarian Kings. However, the increase in power of the Pope and Roman Patriarch resulted in the retread of previous politicians. Which in effect blurred the very fine line between secular and ecclesiastical power.

"See also: First phase of papal supremacy and Early centers of Christianity"
In the early church up until the ecumenical councils, Rome was regarded as an important centre of Christianity, especially since it was the capital of the Roman Empire. The eastern and southern Mediterranean bishops generally recognized a persuasive leadership and authority of the Bishop of Rome, because the teaching of the bishop of Rome was almost invariably correct. But the Mediterranean Church did not regard the Bishop of Rome as any sort of infallible source, nor did they acknowledge any juridical authority of Rome.

A 1st-century example occurred in the year 90, when a group of Corinthian clerics, who had been removed from their positions, petitioned Rome for help.

The church at Rome claimed a special authority over the other churches due, in part, to its connection with the apostles Peter and Paul. In the first three centuries, Rome gained increasing recognition as one of the centers of Christianity. However, the extant documents of that era yield "no clear-cut claims to, or recognition, of papal primacy."

The historian Will Durant writes that, after Jerusalem, the church of Rome naturally became the primary church, the capital of Christianity. Rome had an early and significant Christian population. It was closely identified with the Apostle Paul, who preached and was martyred there, and the Apostle Peter, who was a martyr there as well. The Eastern Orthodox liturgy calls Peter and Paul "the wisest Apostles and their princes" and "the radiant ornaments of Rome". Peter is seen as founder of the Church in Rome, and the bishops of Rome as his successors. While the Eastern cities of Alexandria and Antioch produced theological works, the bishops of Rome focused on what Romans admittedly did best: administration.

Father Thomas Hopko, a leading Orthodox theologian, has written: "The church of Rome held a special place of honor among the earliest Christian churches. It was first among the communities that recognized each other as catholic churches holding the orthodox faith concerning God's Gospel in Jesus. According to St Ignatius, the bishop of Antioch who died a martyr's death in Rome around the year 110, 'the church which presides in the territories of the Romans' was 'a church worthy of God, worthy of honor, worthy of felicitation, worthy of praise, worthy of success, worthy of sanctification, and presiding in love, maintaining the law of Christ, bearer of the Father's name.' The Roman church held this place of honor and exercised a 'presidency in love' among the first Christian churches for two reasons. It was founded on the teaching and blood of the foremost Christian apostles Peter and Paul. And it was the church of the capital city of the Roman empire that then constituted the 'civilized world (oikoumene)'."

Towards the end of the 2nd century, Victor, the Bishop of Rome, attempted to resolve the Quartodeciman controversy by excommunicating churches in the Roman province of Asia. This incident is cited by some Orthodox Christians as the first example of overreaching by the Bishop of Rome and resistance of such by Eastern churches. Laurent Cleenewerck suggests that this could be argued to be the first fissure between the Eastern and Western churches.

The Quartodeciman controversy arose because Christians in the Roman province of Asia (Western Anatolia) celebrated Easter at the spring full moon, like the Jewish Passover, while the churches in the rest of the world observed the practice of celebrating it on the following Sunday ("the day of the resurrection of our Saviour")

In 155, Anicetus, Bishop of Rome presided over a church council at Rome that was attended by a number of bishops including Polycarp, Bishop of Smyrna. Although the council failed to reach agreement on the issue, ecclesiastical communion was preserved. A generation later, synods of bishops in Palestine, Pontus (Northern Anatolia) and Osrhoene in the east, and in Rome and Gaul in the west, unanimously declared that the celebration should be exclusively on Sunday. In 193, Pope Victor I presided over a council in Rome and subsequently sent a letter about the matter to Polycrates of Ephesus and the churches of the Roman province of Asia. In the same year, Polycrates presided over a council at Ephesus attended by several bishops throughout that province, which rejected Victor's authority and kept the province's paschal tradition. Thereupon, Victor attempted to cut off Polycrates and the others who took this stance from the common unity, but later reversed his decision after bishops that included Saint Irenaeus, Bishop of Lugdunum in Gaul, interceded, recommending that Victor adopt the more tolerant stance of his predecessor, Anicetus.

Despite Victor's failure to carry out his intent to excommunicate the Asian churches, many Catholic apologists point to this episode as evidence of papal primacy and authority in the early Church, citing the fact that none of the bishops challenged his right to excommunicate but rather questioned the wisdom and charity of doing so. Orthodox apologists argue that Victor had to relent in the end and note that the Eastern Churches never granted Victor presidency over anything other than the Church of Rome. Cleenewerck points out that Eusebius of Caesarea simply refers to Victor one of the "rulers of the Churches", not the ruler of a yet unknown or unformed 'universal Church.' Ultimately, the Quartodeciman controversy not resolved by papal authority; it was only finally resolved by an ecumenical council, the First Council of Nicaea.

The rejection of Bishop Anicetus' position on the Quartodeciman, by Polycarp and later Polycrates' letter to Pope Victor I has been used by Orthodox theologians as proof against the argument that the Churches in Asia Minor accepted the Primacy of the Bishop of Rome and or the teaching of Papal supremacy.

The opinion of the Bishop of Rome was often sought, especially when the patriarchs of the Eastern Mediterranean were locked in fractious dispute. The bishops of Rome never obviously belonged to either the Antiochian or the Alexandrian schools of theology, and usually managed to steer a middle course between whatever extremes were being propounded by theologians of either school. Because Rome was remote from the centres of Christianity in the eastern Mediterranean, it was frequently hoped its bishop would be more impartial. For instance, in 431, Cyril, the patriarch of Alexandria, appealed to Pope Celestine I, as well as the other patriarchs, charging Nestorius with heresy, which was dealt with at the Council of Ephesus.

The opinion of the Bishop of Rome was always canvassed, and was often longed for. However the Bishop of Rome's opinion was by no means automatically right. For instance, the Tome of Leo of Rome was highly regarded, and formed the basis for the ecumenical council's formulation. But it was not universally accepted and was even called "impious" and "blasphemous" by some. The next ecumenical council corrected a possible imbalance in Pope Leo's presentation. Although the Bishop of Rome was well respected even at this early date, the East holds that the concept of the primacy of the Roman See and Papal Infallibility were only developed much later.

Following the Sack of Rome by invading European Goths, Rome slid into the Dark Ages which afflicted most parts of Western Europe, and became increasingly isolated and irrelevant to the wider Mediterranean Church. This was a situation which suited and pleased a lot of the Eastern Mediterranean patriarchs and bishops.

It was not until the rise of Charlemagne and his successors that the Church of Rome arose out of obscurity on the back of the military successes of the western Mediterranean adventurers.

After the sole emperor of all the Roman Empire Constantine built the new imperial capital at Byzantium, a strategically placed city on the Bosporus. He renamed his new capital "Nova Roma" ("New Rome"), but the city would become known as Constantinople. The centre of gravity in the empire was fully recognised to have completely shifted to the eastern Mediterranean. Rome lost the Senate to Constantinople and lost its status and gravitas as imperial capital, see also Fall of Rome.
Soon the local bishop was elevated to Patriarch under Constantine, as Metrophanes of Byzantium
The patriarchs of Constantinople often tried to adopt an imperious position over the other patriarchs. In the case of Nestorius, whose actual teaching is now recognised to be not overtly heretical, although it is clearly deficient, (Saint Cyril called it'slippery'), other patriarchs were able to make the charge of heresy stick and successfully had him deposed. This was probably more because his Christology was delivered with a heavy sarcastic arrogance which matched his high-handed personality.
In the fourth century, when the Roman emperors (reigning in Constantinople) were trying to control the Church, theological questions ran rampant throughout the Roman Empire. The influence of Greek speculative thought on Christian thinking led to all sorts of divergent and conflicting opinions. Theology was also used as a weapon against opponent bishops, because being branded a heretic was the only sure way for a bishop to be removed by other bishops—incompetence was not sufficient grounds for removal.

The bishop of Byzantium was under the authority of the metropolitan of Heraclea when in 330 Roman Emperor Constantine I moved his residence to this town, which, rebuilt on a larger scale, became known as Constantinople. Thereafter, the bishop's connection with the imperial court meant that he was able to free himself from ecclesiastical dependency on Heraclea and in little more than half a century to obtain recognition of next-after-Rome ranking from the first Council held within the walls of the new capital. The First Council of Constantinople (381). The Western bishops also took no part and which the Latin Church recognized as ecumenical only in the mid-6th century, decreed: "The Bishop of Constantinople, however, shall have the prerogative of honour after the Bishop of Rome; because Constantinople is New Rome", thus raising it above the sees of Alexandria and Antioch. This has been described as sowing the seed for the ecclesiastical rivalry between Constantinople and Rome that was a factor leading to the schism between East and West and was a basic fact in papal history

Alexandria's objections to Constantinople's promotion, which led to a constant struggle between the two sees in the first half of the 5th century, were supported by Rome, which proposed the theory that the most important sees were the three Petrine ones, with Rome in first place. However, after the Council of Chalcedon (451), the position of the Patriarchate of Alexandria was weakened by a division in which the great majority of its Christian population followed the form of Christianity that its opponents called Monophysitism.
The patriarch of the imperial capital succeeded in his efforts to become the leading bishop in the Byzantine Empire: he "headed a vast curia and other bishops who resided in Constantinople constituted a permanent synod, which became the real governing body of the church".

Patriarch John IV of Constantinople, who died in 595, assumed the title of "Ecumenical Patriarch".

When the Roman Emperor Constantine the Great embraced Christianity, he summoned the First Ecumenical Council at Nicaea in 325 to resolve a number of issues which troubled the Church. The bishops at the council confirmed the position of the metropolitan sees of Rome and Alexandria as having authority outside their own province, and also the existing privileges of the churches in Antioch and the other provinces. These sees were later called Patriarchates and were given an order of precedence: Rome, as capital of the empire was naturally given first place, then came Alexandria and Antioch. In a separate canon the Council also approved the special honor given to Jerusalem over other sees subject to the same metropolitan.

In 342 Pope Julius I wrote: "The custom has been for word to be written first to us [in the case of bishops under accusation, and notably in apostolic churches], and then for a just sentence to be passed from this place".

Emperor Theodosius I called the Council of 381. The Second Ecumenical Council, held at the new capital in 381, elevated the see of Constantinople, to a position ahead of the other chief metropolitan sees, except that of Rome. It divided the eastern Roman Empire into five "dioceses": Egypt (under Alexandria), the East (under Antioch), Asia (under Ephesus), Pontus (under Caesarea Cappadociae), and Thrace (originally under Heraclea, later under Constantinople); The council mentioned in particular the provinces of Asia, Pontus and Thrace, it decreed that the synod of each province should manage the ecclesiastical affairs of that province alone, except for the privileges already recognized for Alexandria and Antioch.

In 382 a synod in Rome under Pope Damasus I that protested against the raising of Constantinople to a position above that of Alexandria, spoke of Rome as "the apostolic see". Pope Siricius (384-399) claimed for papal decretals the same binding force as decisions of synods, Pope Innocent I (401-417) said that all major judicial cases should be reserved for the see of Rome, and Pope Boniface I (418-422) declared that the church of Rome stands to "the churches throughout the world as the head to its members" and that bishops everywhere, while holding the one same episcopal office, must "recognise those to whom, for the sake of ecclesiastical discipline, they should be subject". Pope Celestine I (422-432) considered that the condemnation of Nestorius by his own Roman synod in 430 was sufficient, but consented to the general council as "of benefit in manifesting the faith" Pope Leo I and his successors rejected canon 28 of the Council of Chalcedon, as a result of which it was not officially recorded even in the East until the 6th century. The Acacian schism (484-519), when, "for the first time, West lines up against East in a clear-cut fashion", ended with acceptance of a declaration insisted on by Pope Hormisdas (514-523) that "I hope I shall remain in communion with the apostolic see in which is found the whole, true, and perfect stability of the Christian religion". Earlier, in 494, Pope Gelasius I (492-496) wrote to Byzantine Emperor Anastasius, distinguishing the power of civil rulers from that of the bishops (called "priests" in the document), with the latter supreme in religious matters; he ended his letter with: "And if it is fitting that the hearts of the faithful should submit to all priests in general who properly administer divine affairs, how much the more is obedience due to the bishop of that see which the Most High ordained to be above all others, and which is consequently dutifully honoured by the devotion of the whole Church." Pope Nicholas I (858-867) made it clear that he believed the power of the papacy extended "over all the earth, that is, over every church". Eastern Orthodox state that the 28th Canon of the Council of Chalcedon explicitly proclaimed the equality of the Bishops of Rome and Constantinople, and that it established the highest court of ecclesiastical appeal in Constantinople.

The Fourth Ecumenical Council at Chalcedon in 451, confirming the authority already held by Constantinople, granted its archbishop jurisdiction over Pontus and Thrace.

The council also ratified an agreement between Antioch and Jerusalem, whereby Jerusalem held jurisdiction over three provinces, numbering it among the five great sees. There were now five patriarchs presiding over the Church within the Byzantine Empire, in the following order of precedence: the Patriarch of Rome, the Patriarch of Constantinople, the Patriarch of Alexandria, the Patriarch of Antioch and the Patriarch of Jerusalem. The Pope being considered the first among equals.

Although Pope Leo I, whose delegates were absent when this resolution was passed, he recognized the council as ecumenical and confirmed its doctrinal decrees. He rejected its canon 28 on the ground that it contravened the sixth canon of Nicaea and infringed the rights of Alexandria and Antioch. However, by that time Constantinople, the permanent residence of the emperor, had in reality enormous influence, and had it not been for the opposition of Rome, its bishop could easily have been given first place among all the bishops.

In its disputed 28th canon, the Council also recognized an authority of Constantinople over bishops of dioceses "among the barbarians", which has been variously interpreted as referring either to all areas outside the Byzantine Empire or only to those in the vicinity of Pontus, Asia and Thrace or to non-Greeks within the empire. This canon would remain a constant source of friction between East and West until the mutual excommunications of 1054 made it irrelevant in that regard; but controversy about its applicability to the authority of the patriarchate of Constantinople still continues.

Canon 9 of the Council also declared: "If a bishop or clergyman should have a difference with the metropolitan of the province, let him have recourse to the Exarch of the Diocese, or to the throne of the Imperial City of Constantinople, and there let it be tried." This has been interpreted as conferring on the see of Constantinople a greater privilege than what any council ever gave Rome, or as of much lesser significance than that

In 476, the Western Roman Empire in Italy was declared defunct, when the Scirian Odoacer deposed Emperor Romulus Augustulus and declared himself "rex Italiae" ("King of Italy").

Much earlier, the Vandals had crossed the Rhine in 406, entered Iberia in 409, crossed into North Africa in 429 and by 470 had built a kingdom that removed from the Empire all of North Africa, Sicily, Sardinia and other islands of the western Mediterranean and that had sacked Rome in 455. The Visigoths had already invaded Italy and sacked Rome in 410, before settling in Iberia and founding a kingdom that lasted for 200 years. They were followed into Roman territory by the Ostrogoths, led by Theodoric the Great, who settled in Italy. In Gaul the Franks (a fusion of western Germanic tribes whose leaders had been aligned with Rome since the third century AD) entered Roman lands gradually and peacefully during the fifth century, and were accepted as rulers by the Roman-Gaulish population. Fending off challenges from the Allemanni, Burgundians and Visigoths, the Frankish kingdom became the nucleus of the future France and Germany. The initial Anglo-Saxon settlement of Britain also occurred during the 5th century, when Roman control of Britain had come to an end.

By 476 the Germanic chieftain Odoacer had conquered Italy and deposed the last nominal western emperor, Romulus Augustus. He declared himself King of Italy and soon added Dalmatia to his dominions.

Disunion in the Roman Empire further contributed to disunion in the Church. The Emperor Diocletian famously divided the administration of the eastern and western portions of the Empire in the early 4th century, though subsequent leaders (including Constantine) aspired to and sometimes gained control of both regions. Theodosius the Great, who established Nicene Christianity as the official religion of the Roman Empire (see Edict of Thessalonica), was the last Emperor to rule over a united Roman Empire. Following his death in 395, the division into western and eastern halves, each for a few decades still under its own Emperor, was never reunited.

Following the Sack of Rome by invading European Goths, Rome became increasingly isolated from the churches in the eastern and southern Mediterranean. This was a situation which suited and pleased many of the patriarchs and bishops of those churches.

The Western Roman Empire soon ceased to exist. In the early fifth century, its whole territory was overrun by Germanic tribes, and the year 476 saw the end even of the pretence of a Western Roman Emperor, when Odoacer forced Romulus Augustus to abdicate. By the end of the 5th century, the Western Roman Empire had been overrun by the Germanic tribes, while the Eastern Roman Empire (known also as the Byzantine Empire) continued to thrive. Thus, the political unity of the Roman Empire was the first to fall.

When royal and imperial rule reestablished itself, it had to contend with power wielded independently by the Church. In the East, however, imperial and, later, Islamic rule dominated the Eastern bishops of Byzantium. Whereas the Orthodox regions that were predominantly Slavic experienced period foreign dominance as well as period without infrastructure.

The Eastern Roman Empire (known also as the Byzantine Empire) continued to thrive and in the 6th century recovered Italy and other sections of the western Mediterranean shore. It soon lost most of that territory. It continued to hold Rome, as part of the Exarchate of Ravenna, until 751.

Thus, the political unity of what had been the Roman Empire fell.

In the West, the collapse of civil government left the Church practically in charge in many areas, and bishops took to administering secular cities and domains.
In other areas, Christianity became mostly subject to the laws and customs of nations that owed no allegiance to the emperor. These Germanic peoples, particularly the Franks, influenced and changed the Latin Church.

Many other factors caused the East and West to drift further apart. The dominant language of the West was Latin, whilst that of the East was Greek. Soon after the fall of the Western Empire, the number of individuals who spoke both Latin and Greek began to dwindle, and communication between East and West grew much more difficult. When the Latins showed up at councils in the East, they spoke in Latin which was not understood by the other delegates, who continued to speak Greek, which, in turn, was not understood by the Latins. When the Latins had to sign something, it was in a language they didn't understand and had to take someone's word for it. Both sides were suspicious of the other.

With linguistic unity gone, cultural unity began to crumble as well. The two halves of the Church were naturally divided along similar lines; they developed different rites and had different approaches to religious doctrines. Although the Great Schism was still centuries away, its outlines were already perceptible.

By 661, Muslim Arabs had conquered the territories assigned to the patriarchates of Alexandria, Antioch and Jerusalem, which thereafter were never more than partially and temporarily recovered. In 732, Leo III the Isaurian, in revenge for the opposition of Pope Gregory III to the emperor's iconoclast policies, transferred Sicily, Calabria and Illyria from the patriarchate of Rome (whose jurisdiction until then extended as far east as Thessalonica) to that of Constantinople. The Constantinople patriarchate, after expanding eastward at the time of the Council of Chalcedon to take in Pontus and the Roman province of Asia, which at that time were still under the emperor's control, thus expanded equally to the west, and was practically coextensive with the Byzantine Empire.

The West's rejection of the Quinisext Council of 692 led to pressure from the Eastern Empire on the West to reject many Latin customs as non-Orthodox. The Latin practices that had got the attention of the other Patriarchates and that had been condemned by this Council included the practice of celebrating Mass on weekdays in Lent (rather than having Pre-Sanctified Liturgies); fasting on Saturdays throughout the year; omitting the "Alleluia" in Lent; depicting Christ as a lamb; using unleavened bread. Larger disputes were revealed regarding Eastern and Western attitudes toward celibacy for priests and deacons, with the Council affirming the right of married men to become priests (though forbidding priests to marry and forbidding bishops to live with their wives) and prescribing deposition for anyone who attempted to separate a clergyman other than a bishop from his wife, or for any cleric other than a bishop who dismissed his wife.

Pope Sergius I, who was of Syrian origin, rejected the council, preferring, he said, "to die rather than consent to erroneous novelties". Though a loyal subject of the Empire, he would not be "its captive in matters of religion" and refused to sign the canons. Emperor Justinian II ordered his arrest and abduction to Constantinople by the notoriously violent "protospatharios" Zacharias. However, the militia of the exarchate of Ravenna frustrated the attempt. Zacharias nearly lost his life in his attempt to arrest Sergius I. Meanwhile, in Visigothic Spain, the council was ratified by the Eighteenth Council of Toledo at the urging of the king, Wittiza, who was vilified by later chroniclers for his decision. Fruela I of Asturias reversed the decision of Toledo sometime during his reign (757–768).

The Eastern Orthodox churches hold this council be part of the Fifth and Sixth Ecumenical Councils, adding its canons thereto.

The primary causes of the Schism were disputes over conflicting claims of jurisdiction, in particular over papal authority—Pope Leo IX claimed he held authority over the four Eastern patriarchs (see also Pentarchy) – and over the insertion of the Filioque clause into the Nicene Creed by the Western patriarch in 1014. Eastern Orthodox today state that the 28th Canon of the Council of Chalcedon explicitly proclaimed the equality of the Bishops of Rome and Constantinople, and that it established the highest court of ecclesiastical appeal in Constantinople. The seventh canon of the Council of Ephesus declared:

Eastern Orthodox today state that this Canon of the Council of Ephesus explicitly prohibited modification of the Nicene Creed drawn up by the first Ecumenical Council in 325, the wording of which but, it is claimed, not the substance, had been modified by the second Ecumenical Council, making additions such as "who proceeds from the Father".

In the Orthodox view, the Bishop of Rome (i.e. the Pope) would have universal primacy in a reunited Christendom, as "primus inter pares" without power of jurisdiction.

Eastern Orthodox argue that the seventh canon of the Council of Ephesus explicitly prohibited modification of the Nicene Creed by any man (not by Ecumenical church council) drawn up by the first Ecumenical Council in 325. In reality, the Council made no exception for an ecumenical council or any other body of bishops, and the Greeks participating in the Council of Florence emphatically denied that even an ecumenical council had the power to add anything to the creed. The creed quoted in the Acts of the Council of Ephesus of 431 (the third ecumenical council) is that of the first ecumenical council, that of Nicaea (325), without the modifications that the second ecumenical council, held in Constantinople in 381, is understood to have made to it, such as the addition of "who proceeds from the Father". Eastern Orthodox theologians state this change of the wording of the churches' original creed, was done to address various teachings outside of the church in specific the Macedonius I of Constantinople teaching which the council claimed was a distortion of the church's teaching on the Holy Spirit. This was not a change of the orthodoxy of the churches' original creed. Thus the word ἑτέραν in the seventh canon of the later Council of Ephesus is understood as meaning "different", "contradictory", and not "another" in the sense of mere explanatory additions to the already existing creed. Some scholars hold that the additions attributed to the First Council of Constantinople were adopted only with the 451 Council of Chalcedon, 20 years after that of Ephesus, and even that the Council of Ephesus, in which Alexandrian influence was dominant, was by this canon excluding the Constantinopolitan Creed, which eventually annexed the name and fame of the creed adopted at Nicaea.

There were other less significant catalysts for the Schism however, including variance over liturgical practices.

Many other issues increased tensions.

In Eastern Christendom the teaching of Papal Supremacy is called False Isidorean Decretals as it is based on the false documents of Christian canon law under the name Pseudo-Isidore. The Orthodox East contests the teaching that Peter was the Patriarch of Rome as St. Irenaeus says that Pope Linus was the first bishop of Rome and Pope Cletus the second. It is generally conceded that St. Peter was bishop of Antioch who was then succeeded by Evodius and Ignatius. The Eastern Orthodox do not hold the primacy of the Pope of Rome over the Eastern church; they teach that the Pope of Rome is the first among equals. The Seven Ecumenical Councils were held in the East and called by the Eastern Emperors, Roman pontiffs never presided over any of them.

Major break between the Churches of Rome and Constantinople occurred in 863, and lasted for several years. Previously, in 858, Byzantine Emperor Michael III enforced the deposition of Patriarch Ignatios of Constantinople, replacing him with new Patriarch Photios. At least five councils (859, 861, 867, 869-870, 879-880) were held in Constantinople over the deposition of Ignatios and election of Photios. Appealed by the supporters of Ignatios, Pope Nicholas I also held a synod at the Lateran in 863, reverting the decisions of 858, confirming Ignatios as partriarch, and anathematizing Photios. This was seen by the East as an unacceptable intervention, since pope Nicholas I was intervening in the process of election and confirmation of patriarchs in ecclesial jurisdictions other than his own. By attempting to remove Photius and reappoint Ignatius as the Patriarch of Constantinople on his own authority and decree, the Pope was also intervening in the matters of Imperial authority as well as the other churches of the East and their own internal councils and authorities, which they understood to be outside the Pope's own jurisdiction of Rome. In response to that, Council of Constantinople (867) was convened by Photius, to address the question of Papal supremacy, and also the use of Filioque clause in the Creed.

In the Council at Constantinople in 867, Pope Nicholas I was deposed and the teaching of the Filioque was condemned. The Council excommunicated Pope Nicholas I, who was later replaced by Pope Adrian II, due to the death of Nicholas I. the Council also rejected Nicholas' claims of primacy, his efforts to convert Bulgaria, and the addition of the Filioque clause in the Creed.

The council of 867 was followed by the Council of Constantinople in 869-870, that annulled the decisions of 867. The Council of Constantinople in 879-880 then restored the conclusions of the Council of 867. The Roman Catholic Church rejects the councils of 861, 867 and 879-880 but accepts the council of 869-870.

Most of the direct causes of the Great Schism, however, are far less grandiose than the famous "filioque". The relations between the papacy and the Byzantine court were good in the years leading up to 1054. The emperor Constantine IX and the Pope Leo IX were allied through the mediation of the Lombard catepan of Italy, Argyrus, who had spent years in Constantinople, originally as a political prisoner. Leo and Argyrus led armies against the ravaging Normans, but the papal forces were defeated at the Battle of Civitate in 1053, which resulted in the pope being imprisoned at Benevento, where he took it upon himself to learn Greek. Argyrus had not arrived at Civitate and his absence caused a rift in papal-imperial relations.

Meanwhile, the Normans were busy imposing Latin customs, including the unleavened bread—with papal approval. Patriarch Michael I then ordered Leo, Archbishop of Ochrid, to write a letter to the bishop of Trani, John, an Easterner, in which he attacked the "Judaistic" practices of the West, namely the use of unleavened bread. The letter was to be sent by John to all the bishops of the West, including the Pope. John promptly complied, and the letter was passed to Humbert of Mourmoutiers, the cardinal-bishop of Silva Candida, who translated the letter into Latin and brought it to the Pope, who ordered a reply to be made to each charge and a defense of papal supremacy to be laid out in a response.

In 1054, Pope Leo IX sent a letter to Michael Cærularius, Patriarch of Constantinople, that cited a large portion of the forgery called the Donation of Constantine, believing it genuine. The official status of this letter is acknowledged in the 1913 "Catholic Encyclopedia", Volume 5, entry on Donation of Constantine.

Leo IX assured the Patriarch that the donation was completely genuine, not a fable or old wives' tale, so only the apostolic successor to Peter possessed that primacy and was the rightful head of all the Church. The Patriarch rejected the claims of papal primacy.

Michael became convinced to avoid debate and prevent the impending breach. However, Humbert and the pope made no concessions and the former was sent with legatine powers to the imperial capital to solve the questions raised once and for all. Humbert, Frederick of Lorraine, and Peter, Archbishop of Amalfi set out in early spring and arrived in April 1054. They were met with a hostile reception. They stormed out of the palace, leaving the papal response with Michael, whose anger matched their own. The seals on the letter had been tampered with and the legates had published, in Greek, an earlier, far less civil, draft of the letter for the entire populace to read. The patriarch refused to recognize their authority.

When Pope Leo died on 19 April 1054, the legates' authority legally ceased, but they ignored this technicality.

In response to the patriarch's refusal to address the issues at hand, the legatine mission took an extreme measure. On Saturday, 16 July 1054, the three legates produced a Charter of Excommunication (lat. "charta excommunicationis"), directed against Patriarch Michael of Constantinople, Archbishop Leo of Ohrid, and their followers. On the same day, legates entered the church of the Hagia Sophia during the divine liturgy and placed the Charter on the altar. In the Charter, papal legates made 11 accusations against Michael and "the backers of his foolishness", beginning with that of promoting to the episcopacy men who have been castrated and of rebaptizing those already baptized in the name of the Trinity, and ending with the accusation of refusing communion and baptism to menstruating women and of refusing to be in communion with those who tonsure their heads and shave their beards. Denial of the procession of the Holy Spirit from the Son is given seventh place in the list of Greek errors, and a reference was made regarding the alleged Greek exclusion of that doctrine from the Creed.

The legates left Constantinople two days later, after an audience with the Emperor. By the time of their departure, the city near riots. The patriarch had the immense support of the people against the Emperor, who had supported the legates to his own detriment, and Argyrus, who was seen still as a papal ally. To assuage popular anger, Argyrus' family in Constantinople was arrested. An imperial envoy, sent to invite legates to come back for further discuusions, reached them at Selymbria. They attempted to return, but failed and departed for Rome. At that point, Cerularius decided to strike back. A synod of 21 metropolitans and bishops, held on 20 July 1054 in Constantinople and presided by Cerularius, in turn excommunicated the legates. On Sunday 24 July the anathema was officially proclaimed in the Hagia Sophia Church, and copies of the legatine Charter were set to be burnt, while the original was placed in the patriarchal archive. It should be noted here that only the legates were anathematized, and a general reference was made to all who support them, but there was no explicit excommunication of the entire Western Christianity, or the Church of Rome.

Eastern Orthodox bishop Kallistos (formerly Timothy Ware) writes, that the choice of cardinal Humbert was unfortunate, for both he and Patriarch Michael I were men of stiff and intransigent temper.... After [an initial, unfriendly encounter] the patriarch refused to have further dealings with the legates. Eventually Humbert lost patience, and laid a Charter of Excommunication against Patriarch Michael I on the altar of the Church of the Holy Wisdom.... Michael and his synod retaliated by anathematizing Humbert.

The consummation of the schism is generally dated from the year 1054, when this sequence of events took place. However, these events only triggered the beginning of the schism but the schism was not actually consummated by the seemingly mutual excommunications. The New Catholic Encyclopedia reports that the legates had been careful not to intimate that the Charter of Excommunication implied a general excommunication of the Byzantine Church. The Charter excommunicated only Caerularius, Leo of Achrida, and their adherents. Thus, the New Catholic Encyclopedia argues that the dispute need not have produced a permanent schism any more than excommunication of any "contumacious bishop". The schism began to develop when all the other Easter patriarchs supported Caerularius. According to the New Catholic Encyclopedia, it was the support of Emperor Michael VI Stratiotikos that impelled them to support Caerularius. Some have questioned the validity of the Charter on the grounds that Pope Leo IX had died at that time and so the authority of the legates to issue such a document is unclear.

At the time of the excommunications, many contemporary historians, including Byzantine chroniclers, did not consider the event significant. Francis Dvornik stated: "In spite of what happened in 1054, the faithful of both church remained long unaware of any change in their relations and acts of intercommunion were so numerous that 1054 as the date of the schism becomes inadmissible." Kallistos Ware agrees: "Even after 1054 friendly relations between East and West continued. The two parts of Christendom were not yet conscious of a great gulf of separation between them.... The dispute remained something of which ordinary Christians in the East and West were largely unaware." In 1089, the Russian Church felt so little separated from the Western that it instituted a liturgical feast to commemorate the formerly disputed translation of about half of the relics of Saint Nicholas of Myra from Asia to Bari in Italy just two years earlier. This fluidity explains in part the different interpretations of the geographical line of division in the two maps given here, one drawn up in the West, the other in a country where Eastern Orthodoxy predominates. Areas such as the extreme south of Italy are interpreted variously as adhering to either East or West. And even in areas whose rulers took one position, there were some who gave their allegiance to the other side. An example is Kingdom of Hungary, where the Roman Catholic Church was upheld by the crown from the time of Stephen I, but "monasteries and convents belonging to the Byzantine Church were founded sporadically in the eleventh century.

Efforts were made in subsequent centuries by Popes and Patriarchs to heal the rift between the churches. However, a number of factors and historical events worked to widen the separation over time.

The events of July 1054 had various religious and political consequences, both in East and West. Upon their return to Rome in the late summer of 1054, cardinal Humbert and his colleagues found the Roman see still in the state of vacancy. Since there was no pope, all discussions and decisions regarding the Constantinopolitan events of July 1054 had to be postponed, until the next papal conclave. At that time, political situation in Italy was very complex, and because of that the vacancy was prolonged, lasting until the April 1055, when new Pope Victor II was finally elected. New pope was preoccupied with the affairs of the Holy Roman Empire, but after his death in summer of 1057, papal throne was given to no other then cardinal Frederick of Lorraine, one of three envoys of 1054, who was elected pope as Stephen IX. Faced with the Norman menace in southern Italy, new pope decided to send a delegation to Byzantine Emperor Isaac I Komnenos (1057-1059). Papal legates departed from Rome at the beginning of 1058, but soon as they reached Byzantine held Bari, news came that Stephen IX has died, and mission was abandoned.

It remained unknown whether the failed mission of 1058 also had dual, both political and religious aspects, as was the case with the earlier mission of 1054, and also with several later missions. In 1073, contacts between Constantinople and Rome were initiated by Byzantine Emperor Michael VII Doukas (1071-1078), who sent envoys to Pope Gregory VII, and on that occasion some discussions were held regarding both political and religious issues, but no agreement was reached. In 1089, Pope Urban II held the Council of Melfi, reopening the discussion between West and East. The pope approached Byzantine Emperor Alexios I Komnenos (1081-1118), and in the September of the same year a local council was held in Constantinople, reexamining relations between Christian East and West. Similar discussions between Latins and Greeks were also held in 1098, at the Council of Bari.

By the end of the 11th century, the two churches gradually drifted further apart, and continued to diverge over a period of several centuries, with occasional periods of improved relations, marked by several failed attempts of reconciliation. Bishop Kallistos (Ware) wrote: "Even after 1054 friendly relations between East and West continued. The two parts of Christendom were not yet conscious of a great gulf of separation between them.... The dispute remained something of which ordinary Christians in East and West were largely unaware".

Starting from the late 11th century, dependency of Byzantine Empire on the naval forces of Republic of Venice and, to a lesser extent, Republic of Genoa and Republic of Pisa led to predominance of Roman Catholic merchants in Byzantium (they were getting major trading consessions starting from 1080s), subsequently causing economic and social upheaval. Together with the perceived arrogance of the Italians, it fueled popular resentment amongst the middle and lower classes both in the countryside and in the cities.

By the second half of the 12th century practically uncontrollable rivalry between competitors from different city states made it to Italians raiding quarters of other Italians in the capital, and retaliatory draconian measures by the Byzantine authorities led to subsequent deterioration of inter-religious relations in the city.

When in 1182 regency of empress mother Maria of Antioch, an ethnical French notorious for the favoritism shown to Latin merchants and the big aristocratic land-owners, was deposed by Andronikos I Komnenos on the wake of popular support, the new emperor allowed mobs to massacre hated foreigners. Henceforth Byzantine foreign policy was invariably perceived as sinister and anti-Latin in the West.

During the Fourth Crusade, however, Latin crusaders and Venetian merchants sacked Constantinople itself, looting The Church of Holy Wisdom and various other Orthodox Holy sites. looting The Church of Holy Wisdom and various other Orthodox holy sites, and converting them to Latin Catholic worship. Various holy artifacts from these Orthodox holy places were then taken to the West. This event and the final treaty established the Latin Empire of the East and the Latin Patriarch of Constantinople (with various other Crusader states). This period of rule over the Byzantine Empire is known among Eastern Orthodox as Frangokratia (dominion by the Franks).

The break-up of the Byzantine Empire is seen as a factor that led to its conquest by Islam. The crusaders also appointed a Latin Patriarch of Constantinople. An attempt by the Latin Empire to capture the city of Adrianople, then a Bulgarian possession, was defeated in the Battle of Adrianople (1205).

In northern Europe, the Teutonic Knights, after their successes in the northern crusades, attempted to conquer also the Orthodox Russian Republics of Pskov and Novgorod, an enterprise endorsed by Pope Gregory IX. One of the major defeats they suffered was the Battle of the Ice in 1242. Sweden also undertook several campaigns against Orthodox Novgorod. There were also conflicts between Catholic Poland and Orthodox Russia. Such conflicts solidified the schism between East and West.

The Second Council of Lyon was convoked to act on a pledge by Byzantine emperor Michael VIII to reunite the Eastern church with the West. Wishing to end the Great Schism that divided Rome and Constantinople, Gregory X had sent an embassy to Michael VIII Palaeologus, who had reconquered Constantinople, putting an end to the remnants of the Latin Empire in the East, and he asked Latin despots in the East to curb their ambitions.

On 29 June (Feast of Saints Peter and Paul patronal feast of Popes), Gregory X celebrated a Mass in St John's Church, where both sides took part. The council declared that the Roman church possessed "the supreme and full primacy and authority over the universal Catholic Church."

The council was seemingly a success, but did not provide a lasting solution to the schism; the Emperor was anxious to heal the schism, but the Eastern clergy proved to be obstinate. In 1275, Patriarch Joseph I Galesiotes of Constantinople abdicated, and was replaced by John XI Bekkos, a convert to the cause of union. In spite of a sustained campaign by Bekkos to defend the union intellectually, and vigorous and brutal repression of opponents by Michael, the vast majority of Byzantine Christians remained implacably opposed to union with the Latin "heretics". Michael's death in December 1282 put an end to the union of Lyons. His son and successor Andronicus II repudiated the union, and Bekkos was forced to abdicate, being eventually exiled and imprisoned until his death in 1297. He is to this day reviled by many in the Eastern Church as a traitor to Orthodoxy.

In the 15th century, the eastern emperor John VIII Palaeologus, pressed hard by the Ottoman Turks, was keen to ally himself with the West, and to do so he arranged with Pope Eugene IV for discussions about reunion to be held again, this time at the Council of Ferrara-Florence. After several long discussions, the emperor managed to convince the Eastern representatives to accept the Western doctrines of Filioque, Purgatory and the supremacy of the Papacy. On 6 June 1439 an agreement was signed by all the Eastern bishops present but one, Mark of Ephesus, who held that Rome continued in both heresy and schism. It seemed that the Great Schism had been ended. However, upon their return, the Eastern bishops found their agreement with the West broadly rejected by the populace and by civil authorities (with the notable exception of the Emperors of the East who remained committed to union until the Fall of Constantinople two decades later). The union signed at Florence has never been accepted by the Eastern churches.

In 1453, the Eastern Roman Empire fell to the Ottoman Empire. But Orthodoxy was still very strong in Russia which became autocephalous (since 1448, although this was not officially accepted by Constantinople until 1589); and thus Moscow called itself the Third Rome, as the cultural heir of Constantinople.

Eastern Christians expressed a belief that the Fall of Constantinople was God's punishment for the Emperor and clergy accepting the West's doctrines of Filioque, Purgatory, and the supremacy of the Papacy. The West did not fulfill its promise to the Eastern Emperor of troops and support if he agreed to the reconciliation. The Sack of Constantinople is still considered proof by the East that the West ultimately succeeded in its endeavor to destroy the East.

Under Ottoman rule, the Orthodox Church acquired power as an autonomous millet. The ecumenical patriarch was the religious and administrative ruler of the entire Rum Millet (Ottoman administrative unit), which encompassed all the Eastern Orthodox subjects of the Empire. Those appointed to the role were chosen by the Muslim State. In fact, Mehmed II when he conquered the City formally assumed the legal function of the Byzantine Emperors, and the appointment of the patriarch Gennadius II. Mehmed and his agents did all they could to stamp out pro-Roman parties among the Greek Christians, and to that end Mehmed enormously strengthened the Greek church, as this helped to protect the Ottoman Sultunate from any united Christian foe.

As a result of the Ottoman conquest, the entire Orthodox communion of the Balkans and the Near East became suddenly isolated from the West. For the next four hundred years, it would be confined within the Islamic world, with which it had little in common religiously or culturally. The Russian Orthodox Church and the Orthodox Churches from Wallachia and Moldavia were the only part of the Orthodox communion that remained outside the control of the Ottoman Empire.

The growing might of the Moscow contributed also to the growing authority of the Autocephalous Russian Church. In 1589, Metropolitan Job of Moscow became the first Patriarch of Moscow and All Rus'; making the Russian Church one of the five honorable Patriarchates.

However, in 1721 Tsar Peter I abolished completely the patriarchate and so the Church effectively became a department of the government, ruled by a Most Holy Synod composed of senior bishops and lay bureaucrats appointed by the Tsar himself. An independent (from the state) patriarchate was reestablished in 1917, but after the death in 1925 of Patriarch Tikhon of Moscow, who had been persecuted by the Soviet authorities, the patriarchate remained vacant until 1943, when, during the Second World War, the Soviet government allowed somewhat greater freedom to the Church.

The Eastern Catholic Churches consider themselves to have reconciled the East and West Schism by keeping their prayers and rituals similar to those of Eastern Orthodoxy, while also accepting the primacy of the Bishop of Rome. Some Eastern Orthodox charge that joining in this unity comes at the expense of ignoring critical doctrinal differences and past atrocities.

Since the beginnings of the Uniate movement, there have been periodic conflicts between the Orthodox and Uniate in Ukraine and Belarus, then under Polish rule, and later also in Transylvania (see the Romanian Church United with Rome). During Russia's Time of Troubles there was a plan by the conquering Polish monarchy (of Latin Rite, not Uniate) to convert all of Russia to Roman Catholicism. The Russian national holiday, Unity Day, was established due to this conflict. Patriarch Hermogenes was martyred by the Poles and their supporters during this period (see also Polish–Lithuanian–Muscovite Commonwealth).

Similar pressure was also used by the Orthodox against Eastern Catholic Churches such as the Ukrainian Greek Catholic Church.

At a meeting in Balamand, Lebanon in June 1993, the Joint International Commission for the Theological Dialogue between the Roman Catholic Church and the Orthodox Church the delegates of the Eastern Orthodox Churches declared "...and that what has been called 'uniatism' "can no longer be accepted either as a method to be followed nor as a model of the unity our Churches are seeking"" (section 12 of the document).

At the same time, the Commission stated:

The doctrine of papal primacy was further developed in 1870 at the First Vatican Council which declared that "in the disposition of God the Roman church holds the preeminence of ordinary power over all the other churches". This council also affirmed the dogma of papal infallibility, declaring that the infallibility of the Christian community extends to the pope himself, when he defines a doctrine concerning faith or morals to be held by the whole Church.

A major event of the Second Vatican Council, known as Vatican II, was the issuance by Pope Paul and Orthodox Patriarch Athenagoras of a joint expression of regret for many of the past actions that had led up to the Great Schism between the western and eastern churches, expressed as the Catholic-Orthodox Joint declaration of 1965. At the same time, they lifted the mutual excommunications dating from the 11th century.

On June 29, 1995, Pope John Paul II and Patriarch Bartholomew I of Constantinople again withdrew the excommunications imposed in the 11th century and concelebrated the Eucharist together. In May 1999, John Paul II was the first pope since the Great Schism to visit an Eastern Orthodox country: Romania. Upon greeting John Paul II, the Romanian Patriarch Teoctist stated: "The second millennium of Christian history began with a painful wounding of the unity of the Church; the end of this millennium has seen a real commitment to restoring Christian unity."

Pope John Paul II visited other heavily Orthodox areas such as Ukraine, despite lack of welcome at times, and he said that healing the divisions between Western and Eastern Christianity was one of his fondest wishes.

The Roman Catholic Church recently has shown some flexibility on the "Filioque" issue. In accordance with the Roman Catholic Church's practice of including the clause when reciting the Creed in Latin, but not when reciting the Creed in Greek, Popes John Paul II and Benedict XVI have recited the Nicene Creed jointly with Patriarchs Demetrius I and Bartholomew I in Greek without the "Filioque" clause. The action of these Patriarchs in reciting the Creed together with the Popes has been strongly criticized by some elements of Eastern Orthodoxy, such as the Metropolitan of Kalavryta, Greece in November 2008

In 395 Theodosius I, who had made Christianity the official religion of the Roman Empire, would be the last emperor to preside over a united Roman Empire. The empire was split into two halves: the Western Roman Empire centred in Ravenna, and the Eastern Roman Empire (later to be referred to as the Byzantine Empire) centred in Constantinople. The Roman Empire was repeatedly attacked by Hunnic, Germanic, Slavic and other “barbarian” tribes (see: Migration Period), and in 476 finally the Western part fell to the Heruli chieftain Odoacer.

History of Europe

The history of Europe covers the peoples inhabiting Europe from prehistory to the present. During the Neolithic era and the time of the Indo-European migrations Europe saw human inflows from east and southeast and subsequent important cultural and material exchange. The period known as classical antiquity began with the emergence of the city-states of ancient Greece. Later, the Roman Empire came to dominate the entire Mediterranean basin. The fall of the Roman Empire in AD 476 traditionally marks the start of the Middle Ages. Beginning in the 14th century a Renaissance of knowledge challenged traditional doctrines in science and theology. Simultaneously, the Protestant Reformation set up Protestant churches primarily in Germany, Scandinavia and England. After 1800, the Industrial Revolution brought prosperity to Britain and Western Europe. The main powers set up colonies in most of the Americas and Africa, and parts of Asia. In the 20th century, World War I and World War II resulted in massive numbers of deaths. The Cold War dominated European geo-politics from 1947 to 1989. Unification into a European Union moved forward after 1950, with some setbacks. Today, most countries west of Russia belong to the NATO military alliance, along with the United States and Canada.

During the Neolithic era (starting at c. 7000 BC.) and the time of the Indo-European migrations (starting at c. 4000 BC.) Europe saw massive migrations from east and southeast which also brought agriculture, new technologies, and the Indo-European languages, primarily through the areas of the Balkan peninsula and the Black sea region.

Some of the best-known civilizations of the late prehistoric Europe were the Minoan and the Mycenaean, which flourished during the Bronze Age until they collapsed in a short period of time around 1200 BC.

The period known as classical antiquity began with the emergence of the city-states of Ancient Greece. After ultimately checking the Persian advance in Europe through the Greco-Persian Wars in the 5th century BC, Greek influence reached its zenith under the expansive empire of Alexander the Great, spreading throughout Asia, Africa, and other parts of Europe. The Thracians and their kingdoms and culture were long present in Southeast Europe. The Roman Empire came to dominate the entire Mediterranean basin. By 300 AD the Roman Empire was divided into the Western and Eastern empires. During the 4th and 5th centuries, the Germanic peoples of Northern Europe, pressed by the Huns, grew in strength, and repeated attacks led to the Fall of the Western Roman Empire. AD 476 traditionally marks the end of the classical period and the start of the Middle Ages.

In Western Europe, Germanic peoples became more powerful in the remnants of the former Western Roman Empire and established kingdoms and empires of their own. Of all of the Germanic peoples, the Franks would rise to a position of hegemony over Western Europe, the Frankish Empire reaching its peak under Charlemagne around 800. This empire was later divided into several parts; West Francia would evolve into the Kingdom of France, while East Francia would evolve into the Holy Roman Empire, a precursor to modern Germany and Italy. The British Isles were the site of several large-scale migrations.

The Byzantine Empire – the eastern part of the Roman Empire, with its capital Constantinople, survived for the next 1000 years as the most dominant empire in Southeast Europe. The powerful and long lived Bulgarian Empire was its main competitor in the region. Both empires were major powers in that part of Europe for centuries, both creating important cultural, political, linguistic and religious legacy through the Middle Ages to this day.

The Viking Age, a period of migrations of Scandinavian peoples, occurred from the late 8th century to the middle 11th century. The Normans, descendants of the Vikings who settled in Northern France, had a significant impact on many parts of Europe, from the Norman conquest of England to Southern Italy and Sicily. The Rus' people founded Kievan Rus', which evolved into Russia. After 1000 the Crusades were a series of religiously motivated military expeditions originally intended to bring the Levant back under Christian rule. The Crusaders opened trade routes which enabled the merchant republics of Genoa and Venice to become major economic powers. The Reconquista, a related movement, worked to reconquer Iberia for Christendom.

Eastern Europe in the High Middle Ages was dominated by the rise and fall of the Mongol Empire. Led by Genghis Khan, the Mongols were a group of steppe nomads who established a decentralized empire which, at its height, extended from China in the east to the Black and Baltic Seas in Europe. As Mongol power waned towards the Late Middle Ages, the Grand Duchy of Moscow rose to become the strongest of the numerous Russian principalities and republics and would grow into the Tsardom of Russia in 1547. The Late Middle Ages represented a period of upheaval in Europe. The epidemic known as the Black Death and an associated famine caused demographic catastrophe in Europe as the population plummeted. Dynastic struggles and wars of conquest kept many of the states of Europe at war for much of the period. In Scandinavia, the Kalmar Union dominated the political landscape, while England fought with Scotland in the Wars of Scottish Independence and with France in the Hundred Years' War. In Central Europe, the Polish–Lithuanian Commonwealth became a large territorial empire, while the Holy Roman Empire, which was an elective monarchy, came to be dominated for centuries by the House of Habsburg. Russia continued to expand southward and eastward into former Mongol lands. In the Balkans, the Ottoman Empire overran Byzantine lands, culminating in the Fall of Constantinople in 1453, which historians mark as the end of the Middle Ages.

Beginning in the 14th century in Florence and later spreading through Europe, a Renaissance of knowledge challenged traditional doctrines in science and theology. The rediscovery of classical Greek and Roman knowledge had an enormous liberating effect on intellectuals. Simultaneously, the Protestant Reformation under German Martin Luther questioned Papal authority. Henry VIII seized control of the English Church and its lands. The European religious wars between German and Spanish rulers. The Reconquista ended Muslim rule in Iberia. By the 1490s a series of oceanic explorations marked the Age of Discovery, establishing direct links with Africa, the Americas, and Asia. Religious wars continued to be fought in Europe, until the 1648 Peace of Westphalia. The Spanish crown maintained its hegemony in Europe and was the leading power on the continent until the signing of the Treaty of the Pyrenees, which ended a conflict between Spain and France that had begun during the Thirty Years' War. An unprecedented series of major wars and political revolutions took place around Europe and the world in the period between 1610 and 1700.

The Industrial Revolution began in Britain, based on coal, steam, and textile mills. Political change in continental Europe was spurred by the French Revolution under the motto "liberté, égalité, fraternité". Napoleon Bonaparte took control, made many reforms inside France, and transformed Western Europe. But his rise stimulated both nationalism and reaction and he was defeated in 1814–15 as the old royal conservatives returned to power.

The period between 1815 and 1871 saw revolutionary attempts in much of Europe (apart from Britain). They all failed however. As industrial work forces grew in Western Europe, socialism and trade union activity developed. The last vestiges of serfdom were abolished in Russia in 1861. Greece and the other Balkan nations began a long slow road to independence from the Ottoman Empire, starting in the 1820s. Italy was unified in its Risorgimento in 1860. After the Franco-Prussian War of 1870–71, Otto von Bismarck unified the German states into an empire that was politically and militarily dominant until 1914. Most of Europe scrambled for imperial colonies in Africa and Asia in the Age of Empire. Britain and France built the largest empires, while diplomats ensured there were no major wars in Europe, apart from the Crimean War of the 1850s.

The outbreak of the First World War in 1914 was precipitated by the rise of nationalism in Southeastern Europe as the Great Powers took sides. The 1917 October Revolution led the Russian Empire to become the world's first communist state, the Soviet Union. The Allies, led by Britain, France, and the United States, defeated the Central Powers, led by the German Empire and Austria-Hungary, in 1918. During the Paris Peace Conference the Big Four imposed their terms in a series of treaties, especially the Treaty of Versailles. The war's human and material devastation was unprecedented.

Germany lost its overseas empire and several provinces, had to pay large reparations, and was humiliated by the victors. They in turn had large debts to the United States. The 1920s were prosperous until 1929 when the Great Depression broke out, which led to the collapse of democracy in many European states. The Nazi regime under Adolf Hitler came to power in 1933, rearmed Germany, and along with Mussolini's Italy sought to assert themselves on the continent by demands and appeasement, leading eventually to the Second World War. Most of the fighting took place on the Eastern Front, and the war ended with the defeat of the Axis powers, leaving the USSR and the United States dominating Eastern and Western Europe respectively.
The Iron Curtain now separated the east under Moscow's control from the capitalist West. The United States launched the Marshall Plan from 1948–51 and NATO from 1949, and rebuilt industrial economies that all were thriving by the 1950s. France and West Germany took the lead in forming the European Economic Community, which eventually became the European Union (EU). Secularization saw the weakening of Protestant and Catholic churches across most of Europe, except where they were symbols of anti-government resistance, as in Poland. The Revolutions of 1989 brought an end to both Soviet hegemony and communism in Eastern Europe. Germany was reunited, Europe's integration deepened, and both NATO and the EU expanded to the east. The EU came under increasing pressure because of the worldwide recession after 2008.

"Homo erectus" migrated from Africa to Europe before the emergence of modern humans. Lézignan-la-Cèbe in France, Orce in Spain, Monte Poggiolo Italy and Kozarnika in Bulgaria are amongst the oldest Palaeolithic sites in Europe.

The earliest appearance of anatomically modern people in Europe has been dated to 35,000 BC, usually referred to as the Cro-Magnon man. Some locally developed transitional cultures (Uluzzian in Italy and Greece, Altmühlian in Germany, Szeletian in Central Europe and Châtelperronian in the southwest) use clearly Upper Palaeolithic technologies at very early dates.

Nevertheless, the definitive advance of these technologies is made by the Aurignacian culture. The origins of this culture can be located in the Levant (Ahmarian) and Hungary (first full Aurignacian). By 35,000 BC, the Aurignacian culture and its technology had extended through most of Europe. The last Neanderthals seem to have been forced to retreat during this process to the southern half of the Iberian Peninsula.

Around 29,000 BC a new technology/culture appeared in the western region of Europe: the Gravettian. This technology/culture has been theorised to have come with migrations of people from the Balkans (see Kozarnika).

Around 16,000 BC, Europe witnessed the appearance of a new culture, known as Magdalenian, possibly rooted in the old Gravettian. This culture soon superseded the Solutrean area and the Gravettian of mainly France, Spain, Germany, Italy, Poland, Portugal and Ukraine. The Hamburg culture prevailed in Northern Europe in the 14th and the 13th millennium BC as the Creswellian (also termed the British Late Magdalenian) did shortly after in the British Islands.
Around 12,500 BC, the Würm glaciation ended. Slowly, through the following millennia, temperatures and sea levels rose, changing the environment of prehistoric people. Nevertheless, Magdalenian culture persisted until c. 10,000 BC, when it quickly evolved into two "microlithist" cultures: Azilian (Federmesser), in Spain and southern France, and then Sauveterrian, in southern France and Tardenoisian in Central Europe, while in Northern Europe the Lyngby complex succeeded the Hamburg culture with the influence of the Federmesser group as well. Evidence of permanent settlement dates from the 8th millennium BC in the Balkans.

The Indo-European migrations started at around c. 4200 BC. through the areas of the Black sea and the Balkan peninsula in East and Southeast Europe. In the next 3000 years the Indo-European languages expanded through Europe.

In Varna Necropolis – a burial site from 4569–4340 BC and one of the most important archaeological sites in world prehistory, was found the oldest gold treasure (elaborated golden objects) in the world.

The Neolithic reached Central Europe in the 6th millennium BC and parts of Northern Europe in the 5th and 4th millenniums BC.
The first well-known literate civilization in Europe was that of the Minoans. The Minoan civilization was a Bronze Age civilization that arose on the island of Crete and flourished from approximately the 27th century BC to the 15th century BC. It was rediscovered at the beginning of the 20th century through the work of the British archaeologist Arthur Evans. Will Durant referred to it as "the first link in the European chain".

The Minoans were replaced by the Mycenaean civilization which flourished during the period roughly between 1600 BC, when Helladic culture in mainland Greece was transformed under influences from Minoan Crete, and 1100 BC. The major Mycenaean cities were Mycenae and Tiryns in Argolis, Pylos in Messenia, Athens in Attica, Thebes and Orchomenus in Boeotia, and Iolkos in Thessaly. In Crete, the Mycenaeans occupied Knossos. Mycenaean settlement sites also appeared in Epirus, Macedonia, on islands in the Aegean Sea, on the coast of Asia Minor, the Levant, Cyprus and Italy. Mycenaean artefacts have been found well outside the limits of the Mycenean world.

Quite unlike the Minoans, whose society benefited from trade, the Mycenaeans advanced through conquest. Mycenaean civilization was dominated by a warrior aristocracy. Around 1400 BC, the Mycenaeans extended their control to Crete, center of the Minoan civilization, and adopted a form of the Minoan script (called Linear A) to write their early form of Greek in Linear B.

The Mycenaean civilization perished with the collapse of Bronze-Age civilization on the eastern shores of the Mediterranean Sea. The collapse is commonly attributed to the Dorian invasion, although other theories describing natural disasters and climate change have been advanced as well. Whatever the causes, the Mycenaean civilization had definitely disappeared after LH III C, when the sites of Mycenae and Tirynth were again destroyed and lost their importance. This end, during the last years of the 12th century BC, occurred after a slow decline of the Mycenaean civilization, which lasted many years before dying out. The beginning of the 11th century BC opened a new context, that of the protogeometric, the beginning of the geometric period, the "Greek Dark Ages" of traditional historiography.

The Greeks and the Romans left a legacy in Europe which is evident in European languages, thought, visual arts and law. Ancient Greece was a collection of city-states, out of which the original form of democracy developed. Athens was the most powerful and developed city, and a cradle of learning from the time of Pericles. Citizens' forums debated and legislated policy of the state, and from here arose some of the most notable classical philosophers, such as Socrates, Plato, and Aristotle, the last of whom taught Alexander the Great.

Through his military campaigns, the king of the kingdom of Macedon, Alexander, spread Hellenistic culture and learning to the banks of the River Indus. Meanwhile, the Roman Republic strengthened through victory over Carthage in the Punic Wars. Greek wisdom passed into Roman institutions, as Athens itself was absorbed under the banner of the Senate and People of Rome – SPQR.

The Romans expanded from Arabia to Britannia. In 44 BC as it approached its height, its dictator Julius Caesar was murdered by senators in an attempt to restore the Republic. In the ensuing turmoil, Octavian (ruled as Augustus; and as "divi filius", or Son of God, as Julius had adopted him as an heir) usurped the reins of power and fought the Roman Senate. While proclaiming the rebirth of the Republic, he had ushered in the transfer of the Roman state from a republic to an empire, the Roman Empire, which lasted for more than four centuries until the fall of the Western Roman Empire.

The Hellenic civilisation was a collection of city-states or poleis with different governments and cultures that achieved notable developments in government, philosophy, science, mathematics, politics, sports, theatre and music.

The most powerful city-states were Athens, Sparta, Thebes, Corinth, and Syracuse. Athens was a powerful Hellenic city-state and governed itself with an early form of direct democracy invented by Cleisthenes; the citizens of Athens voted on legislation and executive bills themselves. Athens was the home of Socrates, Plato, and the Platonic Academy.

The Hellenic city-states established colonies on the shores of the Black Sea and the Mediterranean (Asian Minor, Sicily and Southern Italy in Magna Graecia). By the late 6th century BC, all the Greek city states in Asia Minor had been incorporated into the Persian Empire, while the latter had made territorial gains in the Balkans (such as Macedon, Thrace, Paeonia, etc.) and Eastern Europe proper as well. In the course of the 5th century BC, some of the Greek city states attempted to overthrow Persian rule in the Ionian Revolt, which failed. This sparked the first Persian invasion of mainland Greece. At some point during the ensuing Greco-Persian Wars, namely during the Second Persian invasion of Greece, and precisely after the Battle of Thermopylae and the Battle of Artemisium, almost all of Greece to the north of the Isthmus of Corinth had been overrun by the Persians, but the Greek city states reached a decisive victory at the Battle of Plataea. With the end of the Greco-Persian wars, the Persians were eventually decisively forced to withdraw from their territories in Europe. The Greco-Persian Wars and the victory of the Greek city states directly influenced the entire further course of European history and would set its further tone. Some Greek city-states formed the Delian League to continue fighting Persia, but Athens' position as leader of this league led Sparta to form the rival Peloponnesian League. The Peloponnesian Wars ensued, and the Peloponnesian League was victorious. Subsequently, discontent with Spartan hegemony led to the Corinthian War and the defeat of Sparta at the Battle of Leuctra. At the same time at the north ruled the Thracian Odrysian Kingdom between the 5th century BC and the 1st century AD.

Hellenic infighting left Greek city states vulnerable, and Philip II of Macedon united the Greek city states under his control. The son of Philip II, known as Alexander the Great, invaded neighboring Persia, toppled and incorporated its domains, as well as invading Egypt and going as far off as India, increasing contact with people and cultures in these regions that marked the beginning of the Hellenistic period.

After the death of Alexander, his empire split into multiple kingdoms ruled by his generals, the Diadochi. The Diadochi fought against each other only three major kingdoms remained: Ptolemaic Egypt, the Seleucid Empire and Macedonia (kingdom). These kingdoms spread Greek culture to regions as far away as Bactria.

Much of Greek learning was assimilated by the nascent Roman state as it expanded outward from Italy, taking advantage of its enemies' inability to unite: the only challenge to Roman ascent came from the Phoenician colony of Carthage, and its defeats in the three Punic Wars marked the start of Roman hegemony. First governed by kings, then as a senatorial republic (the Roman Republic), Rome finally became an empire at the end of the 1st century BC, under Augustus and his authoritarian successors.

The Roman Empire had its centre in the Mediterranean, controlling all the countries on its shores; the northern border was marked by the Rhine and Danube rivers. Under emperor Trajan (2nd century AD) the empire reached its maximum expansion, controlling approximately of land surface, including Italia, Gallia, Dalmatia, Aquitania, Britannia, Baetica, Hispania, Thrace, Macedonia, Greece, Moesia, Dacia, Pannonia, Egypt, Minor Asia, Cappadocia, Armenia, Caucasus, North Africa, Levant and parts of Mesopotamia. Pax Romana, a period of peace, civilisation and an efficient centralised government in the subject territories ended in the 3rd century, when a series of civil wars undermined Rome's economic and social strength.

In the 4th century, the emperors Diocletian and Constantine were able to slow down the process of decline by splitting the empire into a Western part with a capital in Rome and an Eastern part with the capital in Byzantium, or Constantinople (now Istanbul). Whereas Diocletian severely persecuted Christianity, Constantine declared an official end to state-sponsored persecution of Christians in 313 with the Edict of Milan, thus setting the stage for the Church to become the state church of the Roman Empire in about 380.

The Roman Empire had been repeatedly attacked by invading armies from Northern Europe and in 476, Rome finally fell. Romulus Augustus, the last Emperor of the Western Roman Empire, surrendered to the Germanic King Odoacer. The British historian Edward Gibbon argued in "The History of the Decline and Fall of the Roman Empire" (1776) that the Romans had become decadent, they had lost civic virtue.

Gibbon said that the adoption of Christianity, meant belief in a better life after death, and therefore made people lazy and indifferent to the present. "From the eighteenth century onward", Glen W. Bowersock has remarked, "we have been obsessed with the fall: it has been valued as an archetype for every perceived decline, and, hence, as a symbol for our own fears." It remains one of the greatest historical questions, and has a tradition rich in scholarly interest.

Some other notable dates are the Battle of Adrianople in 378, the death of Theodosius I in 395 (the last time the Roman Empire was politically unified), the crossing of the Rhine in 406 by Germanic tribes after the withdrawal of the legions to defend Italy against Alaric I, the death of Stilicho in 408, followed by the disintegration of the western legions, the death of Justinian I, the last Roman Emperor who tried to reconquer the west, in 565, and the coming of Islam after 632. Many scholars maintain that rather than a "fall", the changes can more accurately be described as a complex transformation. Over time many theories have been proposed on why the Empire fell, or whether indeed it fell at all.

When Emperor Constantine had reconquered Rome under the banner of the cross in 312, he soon afterwards issued the Edict of Milan in 313 (preceded by the Edict of Serdica in 311), declaring the legality of Christianity in the Roman Empire. In addition, Constantine officially shifted the capital of the Roman Empire from Rome to the Greek town of Byzantium, which he renamed Nova Roma – it was later named Constantinople ("City of Constantine").

In 395 Theodosius I, who had made Christianity the official religion of the Roman Empire, would be the last emperor to preside over a united Roman Empire. The empire was split into two halves: the Western Roman Empire centred in Ravenna, and the Eastern Roman Empire (later to be referred to as the Byzantine Empire) centred in Constantinople. The Roman Empire was repeatedly attacked by Hunnic, Germanic, Slavic and other “barbarian” tribes (see: Migration Period), and in 476 finally the Western part fell to the Heruli chieftain Odoacer.

Roman authority in the Western part of the empire had collapsed, and a power vacuum left in the wake of this collapse; the central organization, institutions, laws and power of Rome had broken down, resulting in many areas being open to invasion by migrating tribes. Over time, feudalism and manorialism arose, two interlocking institutions that provided for division of land and labor, as well as a broad if uneven hierarchy of law and protection. These localised hierarchies were based on the bond of common people to the land on which they worked, and to a lord, who would provide and administer both local law to settle disputes among the peasants, as well as protection from outside invaders. Unlike under Roman rule, with its standard laws and military across the empire and its great bureaucracy to administer them and collect taxes, each lord (although having obligations to a higher lord) was largely sovereign in his domain. A peasant's lot could vary greatly depending on the leadership skills and attitudes to justice of the lord toward his people. Tithes or rents were paid to the lord, who in turn owed resources, and armed men in times of war, to his lord, perhaps a regional prince. However, the levels of hierarchy were varied over time and place.

The western provinces soon were to be dominated by three great powers: first, the Franks (Merovingian dynasty) in Francia 481–843 AD, which covered much of present France and Germany; second, the Visigothic kingdom 418–711 AD in the Iberian Peninsula (modern Spain); and third, the Ostrogothic kingdom 493–553 AD in Italy and parts of the western Balkans The Ostrogoths were later replaced by the Kingdom of the Lombards 568–774 AD. These new powers of the west built upon the Roman traditions until they evolved into a synthesis of Roman and Germanic cultures. Although these powers covered large territories, they did not have the great resources and bureaucracy of the Roman empire to control regions and localities. The ongoing invasions and boundary disputes usually meant a more risky and varying life than that under the empire. This meant that in general more power and responsibilities were left to local lords. On the other hand, it also meant more freedom, particularly in more remote areas.

In Italy, Theodoric the Great began the cultural romanization of the new world he had constructed. He made Ravenna a center of Romano-Greek culture of art and his court fostered a flowering of literature and philosophy in Latin. In Iberia, King Chindasuinth created the Visigothic Code.
In the Eastern part the dominant state was the remaining Eastern Roman Empire.

In the feudal system, new princes and kings arose, the most powerful of which was arguably the Frankish ruler Charlemagne. In 800, Charlemagne, reinforced by his massive territorial conquests, was crowned Emperor of the Romans (Imperator Romanorum) by Pope Leo III, effectively solidifying his power in western Europe. Charlemagne's reign marked the beginning of a new Germanic Roman Empire in the west, the Holy Roman Empire. Outside his borders, new forces were gathering. The Kievan Rus' were marking out their territory, a Great Moravia was growing, while the Angles and the Saxons were securing their borders.

For the duration of the 6th century, the Eastern Roman Empire was embroiled in a series of deadly conflicts, first with the Persian Sassanid Empire (see Roman–Persian Wars), followed by the onslaught of the arising Islamic Caliphate (Rashidun and Umayyad). By 650, the provinces of Egypt, Palestine and Syria were lost to the Muslim forces, followed by Hispania and southern Italy in the 7th and 8th centuries (see Muslim conquests). The Arab invasion from the east was stopped after the intervention of the Bulgarian Empire (see Han Tervel).

The Middle Ages are commonly dated from the fall of the Western Roman Empire (or by some scholars, before that) in the 5th century to the beginning of the early modern period in the 16th century, marked by the rise of nation states, the division of Western Christianity in the Reformation, the rise of humanism in the Italian Renaissance, and the beginnings of European overseas expansion which allowed for the Columbian Exchange.

Many consider Emperor Constantine I (reigned 306–337) to be the first "Byzantine Emperor". It was he who moved the imperial capital in 324 from Nicomedia to Byzantium, which re-founded as Constantinople, or Nova Roma ("New Rome"). The city of Rome itself had not served as the capital since the reign of Diocletian. Some date the beginnings of the Empire to the reign of Theodosius I (379–395) and Christianity's official supplanting of the pagan Roman religion, or following his death in 395, when the empire was split into two parts, with capitals in Rome and Constantinople. Others place it yet later in 476, when Romulus Augustulus, traditionally considered the last western Emperor, was deposed, thus leaving sole imperial authority with the emperor in the Greek East. Others point to the reorganisation of the empire in the time of Heraclius (c. 620) when Latin titles and usages were officially replaced with Greek versions. In any case, the changeover was gradual and by 330, when Constantine inaugurated his new capital, the process of hellenization and increasing Christianisation was already under way. The Empire is generally considered to have ended after the fall of Constantinople to the Ottoman Turks in 1453. The Plague of Justinian was a pandemic that afflicted the Byzantine Empire, including its capital Constantinople, in the years 541–542. It is estimated that the Plague of Justinian killed as many as 100 million people across the world. It caused Europe's population to drop by around 50% between 541 and 700. It also may have contributed to the success of the Muslim conquests.

The Early Middle Ages span roughly five centuries from 500 to 1000.

In the Eastern part of Europe new dominant states formatted – the Avar Khaganate (567–after 822), Old Great Bulgaria (632–668), the Khazar Khaganate (c. 650–969) and Danube Bulgaria (founded by Asparuh in 680) were constantly rivaling the hegemony of the Byzantine Empire.

From the 7th century Byzantine history was greatly affected by the rise of Islam and the Caliphates. Muslim Arabs first invaded historically Roman territory under Abū Bakr, first Caliph of the Rashidun Caliphate, who entered Roman Syria and Roman Mesopotamia. As the Byzantines and neighboring Sasanids were severely weakened by the time, amongst the most important reason(s) being the protracted, centuries-lasting and frequent Byzantine–Sasanian wars, which included the climactic Byzantine–Sasanian War of 602–628, under Umar, the second Caliph, the Muslims entirely toppled the Sasanid Persian Empire, and decisively conquered Syria and Mesopotamia, as well as Roman Palestine, Roman Egypt, and parts of Asia Minor and Roman North Africa. In the mid 7th century AD, following the Muslim conquest of Persia, Islam penetrated into the Caucasus region, of which parts would later permanently become part of Russia. This trend, which included the conquests by the invading Muslim forces and by that the spread of Islam as well continued under Umar's successors and under the Umayyad Caliphate, which conquered the rest of Mediterranean North Africa and most of the Iberian Peninsula. Over the next centuries Muslim forces were able to take further European territory, including Cyprus, Malta, Crete, and Sicily and parts of southern Italy.

The Muslim conquest of Hispania began when the Moors (Berbers and Arabs) invaded the Christian Visigothic kingdom of Hispania in the year 711, under the Berber general Tariq ibn Ziyad. They landed at Gibraltar on 30 April and worked their way northward. Tariq's forces were joined the next year by those of his Arab superior, Musa ibn Nusair. During the eight-year campaign most of the Iberian Peninsula was brought under Muslim rule – save for small areas in the northwest (Asturias) and largely Basque regions in the Pyrenees. In 711, Visigothic Hispania was very weakened because it was immersed in a serious internal crisis caused by a war of succession to the throne involving two Visigoth suitors. The Muslims took advantage of the crisis that crossed the Hispano-Visigothic society to carry out their conquests. This territory, under the Arab name Al-Andalus, became part of the expanding Umayyad empire.

The second siege of Constantinople (717) ended unsuccessful after the intervention of Tervel of Bulgaria and weakened the Umayyad dynasty and reduced their prestige. In 722 Don Pelayo, a nobleman of Visigothic origin, formed an army of 300 Astur soldiers, to confront Munuza's Muslim troops. In the battle of Covadonga, the Astures defeated the Arab-Moors, who decided to retire. The Christian victory marked the beginning of the Reconquista and the establishment of the Kingdom of Asturias, whose first sovereign was Don Pelayo. The conquerors intended to continue their expansion in Europe and move northeast across the Pyrenees, but were defeated by the Frankish leader Charles Martel at the Battle of Poitiers in 732. The Umayyads were overthrown in 750 by the 'Abbāsids, and, in 756, the Umayyads established an independent emirate in the Iberian Peninsula.

The Holy Roman Empire emerged around 800, as Charlemagne, king of the Franks, was crowned by the pope as emperor. His empire based in modern France, the Low Countries and Germany expanded into modern Hungary, Italy, Bohemia, Lower Saxony and Spain. He and his father received substantial help from an alliance with the Pope, who wanted help against the Lombards.

To the east, Bulgaria was established in 681 and became the first Slavic country. The powerful Bulgarian Empire was the main rival of Byzantium for control of the Balkans for centuries and from the 9th century became the cultural centre of Slavic Europe. The Empire created the Cyrillic script during the 9th century AD, at the Preslav Literary School, and experienced the Golden Age of Bulgarian cultural prosperity during the reign of emperor Simeon I the Great (893–927). Two states, Great Moravia and Kievan Rus', emerged among the Slavic peoples respectively in the 9th century. In the late 9th and 10th centuries, northern and western Europe felt the burgeoning power and influence of the Vikings who raided, traded, conquered and settled swiftly and efficiently with their advanced seagoing vessels such as the longships. The Hungarians pillaged mainland Europe, the Pechenegs raided Bulgaria, Rus States and the Arab states. In the 10th century independent kingdoms were established in Central Europe including Poland and the newly settled Kingdom of Hungary. The kingdoms of Croatia and Serbia also appeared in the Balkans. The subsequent period, ending around 1000, saw the further growth of feudalism, which weakened the Holy Roman Empire.

In eastern Europe, Volga Bulgaria became an Islamic state in 921, after Almış I converted to Islam under the missionary efforts of Ahmad ibn Fadlan.

Slavery in the early medieval period had mostly died out in western Europe by about the year 1000 AD, replaced by serfdom. It lingered longer in England and in peripheral areas linked to the Muslim world, where slavery continued to flourish. Church rules suppressed slavery of Christians. Most historians argue the transition was quite abrupt around 1000, but some see a gradual transition from about 300 to 1000.

The slumber of the Dark Ages was shaken by a renewed crisis in the Church. In 1054, the East–West Schism, an insoluble split, occurred between the two remaining Christian seats in Rome and Constantinople (modern Istanbul).

The High Middle Ages of the 11th, 12th, and 13th centuries show a rapidly increasing population of Europe, which caused great social and political change from the preceding era. By 1250, the robust population increase greatly benefited the economy, reaching levels it would not see again in some areas until the 19th century.

From about the year 1000 onwards, Western Europe saw the last of the barbarian invasions and became more politically organized. The Vikings had settled in Britain, Ireland, France and elsewhere, whilst Norse Christian kingdoms were developing in their Scandinavian homelands. The Magyars had ceased their expansion in the 10th century, and by the year 1000, the Roman Catholic Apostolic Kingdom of Hungary was recognised in central Europe. With the brief exception of the Mongol invasions, major barbarian incursions ceased.

Bulgarian sovereignty was reestablished with the anti-Byzantine uprising of the Bulgarians and Vlachs in 1185. The crusaders invaded the Byzantine empire, captured Constantinople in 1204 and established their Latin Empire. Kaloyan of Bulgaria defeated Baldwin I, Latin emperor of Constantinople, in the Battle of Adrianople on 14April 1205. The reign of Ivan Asen II of Bulgaria led to maximum territorial expansion and that of Ivan Alexander of Bulgaria to a Second Golden Age of Bulgarian culture. The Byzantine Empire was fully reestablished in 1261.

In the 11th century, populations north of the Alps began to settle new lands, some of which had reverted to wilderness after the end of the Roman Empire. In what is known as the "great clearances", vast forests and marshes of Europe were cleared and cultivated. At the same time settlements moved beyond the traditional boundaries of the Frankish Empire to new frontiers in Europe, beyond the Elbe river, tripling the size of Germany in the process. Crusaders founded European colonies in the Levant, the majority of the Iberian Peninsula was conquered from the Muslims, and the Normans colonised southern Italy, all part of the major population increase and resettlement pattern.

The High Middle Ages produced many different forms of intellectual, spiritual and artistic works. The most famous are the great cathedrals as expressions of Gothic architecture, which evolved from Romanesque architecture. This age saw the rise of modern nation-states in Western Europe and the ascent of the famous Italian city-states, such as Florence and Venice. The influential popes of the Catholic Church called volunteer armies from across Europe to a series of Crusades against the Seljuq Turks, who occupied the Holy Land. The rediscovery of the works of Aristotle led Thomas Aquinas and other thinkers to develop the philosophy of Scholasticism.

The Great Schism between the Western (Catholic) and Eastern (Orthodox) Christian Churches was sparked in 1054 by Pope Leo IX asserting authority over three of the seats in the Pentarchy, in Antioch, Jerusalem and Alexandria. Since the mid-8th century, the Byzantine Empire's borders had been shrinking in the face of Islamic expansion. Antioch had been wrested back into Byzantine control by 1045, but the resurgent power of the Roman successors in the West claimed a right and a duty for the lost seats in Asia and Africa. Pope Leo sparked a further dispute by defending the filioque clause in the Nicene Creed which the West had adopted customarily. The Orthodox today state that the XXVIIIth Canon of the Council of Chalcedon explicitly proclaimed the equality of the Bishops of Rome and Constantinople. The Orthodox also state that the Bishop of Rome has authority only over his own diocese and does not have any authority outside his diocese. There were other less significant catalysts for the Schism however, including variance over liturgy. The Schism of Roman Catholic and Orthodox followed centuries of estrangement between the Latin and Greek worlds.

Further changes were set afoot with a redivision of power in Europe. William the Conqueror, a Duke of Normandy, invaded England in 1066. The Norman Conquest was a pivotal event in English history for several reasons. This linked England more closely with continental Europe through the introduction of a Norman aristocracy, thereby lessening Scandinavian influence. It created one of the most powerful monarchies in Europe and engendered a sophisticated governmental system. Being based on an island, moreover, England was to develop a powerful navy and trade relationships that would come to encompass a vast proportion of the world including India, Australia, New Zealand, Canada and many key naval strategic points like Bermuda, Suez, Hong Kong and especially Gibraltar. These strategic advantages grew and were to prove decisive until after the Second World War.

After the East–West Schism, Western Christianity was adopted by the newly created kingdoms of Central Europe: Poland, Hungary and Bohemia. The Roman Catholic Church developed as a major power, leading to conflicts between the Pope and Emperor. The geographic reach of the Roman Catholic Church expanded enormously due to the conversions of pagan kings (Scandinavia, Lithuania, Poland, Hungary), the Christian Reconquista of Al-Andalus, and the crusades. Most of Europe was Roman Catholic in the 15th century.

Early signs of the rebirth of civilization in western Europe began to appear in the 11th century as trade started again in Italy, leading to the economic and cultural growth of independent city-states such as Venice and Florence; at the same time, nation-states began to take form in places such as France, England, Spain, and Portugal, although the process of their formation (usually marked by rivalry between the monarchy, the aristocratic feudal lords and the church) actually took several centuries. These new nation-states began writing in their own cultural vernaculars, instead of the traditional Latin. Notable figures of this movement would include Dante Alighieri and Christine de Pizan (born Christina da Pizzano), the former writing in Italian, and the latter, although an Italian (Venice), relocated to France, writing in French. (See Reconquista for the latter two countries.) Elsewhere, the Holy Roman Empire, essentially based in Germany and Italy, further fragmented into a myriad of feudal principalities or small city states, whose subjection to the emperor was only formal.

The 14th century, when the Mongol Empire came to power, is often called the "Age of the Mongols". Mongol armies expanded westward under the command of Batu Khan. Their western conquests included almost all of Russia (save Novgorod, which became a vassal), the Kipchak-Cuman Confederation. Bulgaria, Hungary, and Poland managed to remain sovereign states. Mongolian records indicate that Batu Khan was planning a complete conquest of the remaining European powers, beginning with a winter attack on Austria, Italy and Germany, when he was recalled to Mongolia upon the death of Great Khan Ögedei. Most historians believe only his death prevented the complete conquest of Europe. The areas of Eastern Europe and most of Central Asia that were under direct Mongol rule became known as the Golden Horde. Under Uzbeg Khan, Islam became the official religion of the region in the early 14th century. The invading Mongols, together with their mostly Turkic subjects, were known as Tatars. In Russia, the Tatars ruled the various states of the Rus' through vassalage for over 300 years.
In the Northern Europe, Konrad of Masovia gave Chelmno to the Teutonic Knights in 1226 as a base for a Crusade against the Old Prussians and Grand Duchy of Lithuania. The Livonian Brothers of the Sword were defeated by the Lithuanians, so in 1237 Gregory IX merged the remainder of the order into the Teutonic Order as the Livonian Order. By the middle of the century, the Teutonic Knights completed their conquest of the Prussians before conquering and converting the Lithuanians in the subsequent decades. The order also came into conflict with the Eastern Orthodox Church of the Pskov and Novgorod Republics. In 1240 the Orthodox Novgorod army defeated the Catholic Swedes in the Battle of the Neva, and, two years later, they defeated the Livonian Order in the Battle on the Ice. The Union of Krewo in 1386, bringing two major changes in the history of the Grand Duchy of Lithuania: conversion to Catholicism and establishment of a dynastic union between the Grand Duchy of Lithuania and the Crown of the Kingdom of Poland marked both the greatest territorial expansion of the Grand Duchy and the defeat of the Teutonic Knights in the Battle of Grunwald in 1410.

The Late Middle Ages spanned the 14th and early 15th centuries. Around 1300, centuries of European prosperity and growth came to a halt. A series of famines and plagues, such as the Great Famine of 1315–1317 and the Black Death, killed people in a matter of days, reducing the population of some areas by half as many survivors fled. Kishlansky reports:

Depopulation caused labor to become scarcer; the survivors were better paid and peasants could drop some of the burdens of feudalism. There was also social unrest; France and England experienced serious peasant risings including the Jacquerie and the Peasants' Revolt. At the same time, the unity of the Catholic Church was shattered by the Great Schism. Collectively these events have been called the Crisis of the Late Middle Ages.

Beginning in the 14th century, the Baltic Sea became one of the most important trade routes. The Hanseatic League, an alliance of trading cities, facilitated the absorption of vast areas of Poland, Lithuania, and Livonia into trade with other European countries. This fed the growth of powerful states in this part of Europe including Poland-Lithuania, Hungary, Bohemia, and Muscovy later on. The conventional end of the Middle Ages is usually associated with the fall of the city of Constantinople and of the Byzantine Empire to the Ottoman Turks in 1453. The Turks made the city the capital of their Ottoman Empire, which lasted until 1922 and included Egypt, Syria, and most of the Balkans. The Ottoman wars in Europe, also sometimes referred to as the Turkish wars, marked an essential part of the history of the continent as a whole.

The Early Modern period spans the centuries between the Middle Ages and the Industrial Revolution, roughly from 1500 to 1800, or from the discovery of the New World in 1492 to the French Revolution in 1789. The period is characterised by the rise to importance of science and increasingly rapid technological progress, secularised civic politics and the nation state. Capitalist economies began their rise, beginning in northern Italian republics such as Genoa. The early modern period also saw the rise and dominance of the economic theory of mercantilism. As such, the early modern period represents the decline and eventual disappearance, in much of the European sphere, of feudalism, serfdom and the power of the Catholic Church. The period includes the Protestant Reformation, the disastrous Thirty Years' War, the European colonisation of the Americas and the European witch-hunts.

Despite these crises, the 14th century was also a time of great progress within the arts and sciences. A renewed interest in ancient Greek and Roman as well as more recent Arabic texts led to what has later been termed the Italian Renaissance.

The Renaissance was a cultural movement that profoundly affected European intellectual life in the early modern period. Beginning in Italy, and spreading to the north, west and middle Europe during a cultural lag of some two and a half centuries, its influence affected literature, philosophy, art, politics, science, history, religion, and other aspects of intellectual enquiry.

The Italian Petrarch (Francesco di Petracco), deemed the first full-blooded Humanist, wrote in the 1330s: "I am alive now, yet I would rather have been born in another time." He was enthusiastic about Greek and Roman antiquity. In the 15th and 16th centuries the continuing enthusiasm for the ancients was reinforced by the feeling that the inherited culture was dissolving and here was a storehouse of ideas and attitudes with which to rebuild. Matteo Palmieri wrote in the 1430s: "Now indeed may every thoughtful spirit thank god that it has been permitted to him to be born in a new age." The renaissance was born: a new age where learning was very important.

The Renaissance was inspired by the growth in study of Latin and Greek texts and the admiration of the Greco-Roman era as a golden age. This prompted many artists and writers to begin drawing from Roman and Greek examples for their works, but there was also much innovation in this period, especially by multi-faceted artists such as Leonardo da Vinci. The Humanists saw their repossession of a great past as a Renaissance – a rebirth of civilization itself.

Important political precedents were also set in this period. Niccolò Machiavelli's political writing in "The Prince" influenced later absolutism and real-politik. Also important were the many patrons who ruled states and used the artistry of the Renaissance as a sign of their power.

In all, the Renaissance could be viewed as an attempt by intellectuals to study and improve the secular and worldly, both through the revival of ideas from antiquity, and through novel approaches to thought – the immediate past being too "Gothic" in language, thought and sensibility.

During this period, Spain experienced the greatest epoch of cultural splendor in its history. This epoch is known as the Spanish Golden age and took place between the sixteenth and seventeenth centuries.

Toward the end of the period, an era of discovery began. The growth of the Ottoman Empire, culminating in the fall of Constantinople in 1453, cut off trading possibilities with the east. Western Europe was forced to discover new trading routes, as happened with Columbus' travel to the Americas in 1492, and Vasco da Gama's circumnavigation of India and Africa in 1498.

The numerous wars did not prevent European states from exploring and conquering wide portions of the world, from Africa to Asia and the newly discovered Americas. In the 15th century, Portugal led the way in geographical exploration along the coast of Africa in search of a maritime route to India, followed by Spain near the close of the 15th century, dividing their exploration of the world according to the Treaty of Tordesillas in 1494. They were the first states to set up colonies in America and European trading posts (factories) along the shores of Africa and Asia, establishing the first direct European diplomatic contacts with Southeast Asian states in 1511, China in 1513 and Japan in 1542. In 1552, Russian tsar Ivan the Terrible conquered two major Tatar khanates, the Khanate of Kazan and the Astrakhan Khanate. The Yermak's voyage of 1580 led to the annexation of the Tatar Siberian Khanate into Russia, and the Russians would soon after conquer the rest of Siberia, steadily expanding to the east and south over the next centuries. Oceanic explorations soon followed by France, England and the Netherlands, who explored the Portuguese and Spanish trade routes into the Pacific Ocean, reaching Australia in 1606 and New Zealand in 1642.

With the development of the printing press, new ideas spread throughout Europe and challenged traditional doctrines in science and theology. Simultaneously, the Protestant Reformation under German Martin Luther questioned Papal authority. The most common dating of the Reformation begins in 1517, when Luther published "The Ninety-Five Theses", and concludes in 1648 with the Treaty of Westphalia that ended years of European religious wars.

During this period corruption in the Catholic Church led to a sharp backlash in the Protestant Reformation. It gained many followers especially among princes and kings seeking a stronger state by ending the influence of the Catholic Church. Figures other than Martin Luther began to emerge as well like John Calvin whose Calvinism had influence in many countries and King Henry VIII of England who broke away from the Catholic Church in England and set up the Anglican Church; his daughter Queen Elizabeth finished the organization of the church. These religious divisions brought on a wave of wars inspired and driven by religion but also by the ambitious monarchs in Western Europe who were becoming more centralised and powerful.

The Protestant Reformation also led to a strong reform movement in the Catholic Church called the Counter-Reformation, which aimed to reduce corruption as well as to improve and strengthen Catholic dogma. Two important groups in the Catholic Church who emerged from this movement were the Jesuits, who helped keep Spain, Portugal, Poland and other European countries within the Catholic fold, and the Oratorians of Saint Philip Neri, who ministered to the faithful in Rome, restoring their confidence in the Church of Jesus Christ that subsisted substantially in the Church of Rome. Still, the Catholic Church was somewhat weakened by the Reformation, portions of Europe were no longer under its sway and kings in the remaining Catholic countries began to take control of the church institutions within their kingdoms.

Unlike many European countries, the Polish–Lithuanian Commonwealth and Hungary were more tolerant. While still enforcing the predominance of Catholicism, they continued to allow the large religious minorities to maintain their faiths, traditions and customs. The Polish–Lithuanian Commonwealth became divided among Catholics, Protestants, Orthodox, Jews and a small Muslim population.

Another important development in this period was the growth of pan-European sentiments. Eméric Crucé (1623) came up with the idea of the European Council, intended to end wars in Europe; attempts to create lasting peace were no success, although all European countries (except the Russian and Ottoman Empires, regarded as foreign) agreed to make peace in 1518 at the Treaty of London. Many wars broke out again in a few years. The Reformation also made European peace impossible for many centuries.

Another development was the idea of 'European superiority'. The ideal of civilisation was taken over from the ancient Greeks and Romans: Discipline, education and living in the city were required to make people civilised; Europeans and non-Europeans were judged for their civility, and Europe regarded itself as superior to other continents. There was a movement by some such as Montaigne that regarded the non-Europeans as a better, more natural and primitive people. Post services were founded all over Europe, which allowed a humanistic interconnected network of intellectuals across Europe, despite religious divisions. However, the Roman Catholic Church banned many leading scientific works; this led to an intellectual advantage for Protestant countries, where the banning of books was regionally organised. Francis Bacon and other advocates of science tried to create unity in Europe by focusing on the unity in nature. In the 15th century, at the end of the Middle Ages, powerful sovereign states were appearing, built by the New Monarchs who were centralising power in France, England, and Spain. On the other hand, the Parliament in the Polish–Lithuanian Commonwealth grew in power, taking legislative rights from the Polish king. The new state power was contested by parliaments in other countries especially England. New kinds of states emerged which were co-operation agreements among territorial rulers, cities, farmer republics and knights.

The Iberian states (Spain and Portugal) were able to dominate New World (American) colonial activity in the 16th century. The Spanish constituted the first global empire and during the 16th century and the first half of the 17th century, Spain was the most powerful nation in the world, but was increasingly challenged by British, French, and the short-lived Dutch and Swedish colonial efforts of the 17th and 18th centuries. New forms of trade and expanding horizons made new forms of government, law and eco nomics necessary.

Colonial expansion continued in the following centuries (with some setbacks, such as successful wars of independence in the British American colonies and then later Haiti, Mexico, Argentina, Brazil, and others amid European turmoil of the Napoleonic Wars; Haiti unique in abolishing slavery). Spain had control of a large part of North America, all of Central America and a great part of South America, the Caribbean and the Philippines; Britain took the whole of Australia and New Zealand, most of India, and large parts of Africa and North America; France held parts of Canada and India (nearly all of which was lost to Britain in 1763), Indochina, large parts of Africa and the Caribbean islands; the Netherlands gained the East Indies (now Indonesia) and islands in the Caribbean; Portugal obtained Brazil and several territories in Africa and Asia; and later, powers such as Germany, Belgium, Italy and Russia acquired further colonies.

This expansion helped the economy of the countries owning them. Trade flourished, because of the minor stability of the empires. By the late 16th century, American silver accounted for one-fifth of Spain's total budget. The European countries fought wars that were largely paid for by the money coming in from the colonies. Nevertheless, the profits of the slave trade and of plantations of the West Indies, then the most profitable of all the British colonies, amounted to less than 5% of the British Empire's economy (but was generally more profitable) at the time of the Industrial Revolution in the late 18th century.

The 17th century was an era of crisis. Many historians have rejected the idea, while others promote it as an invaluable insight into the warfare, politics, economics, and even art. The Thirty Years' War (1618–1648) focused attention on the massive horrors that wars could bring to entire populations. The 1640s in particular saw more state breakdowns around the world than any previous or subsequent period. The Polish-Lithuanian Commonwealth, the largest state in Europe, temporarily disappeared. In addition, there were secessions and upheavals in several parts of the Spanish empire, the world's first global empire. In Britain the entire Stuart monarchy (England, Scotland, Ireland, and its North American colonies) rebelled. Political insurgency and a spate of popular revolts seldom equalled shook the foundations of most states in Europe and Asia. More wars took place around the world in the mid-17th century than in almost any other period of recorded history. The crises spread far beyond Europe – for example Ming China, the most populous state in the world, collapsed. Across the Northern Hemisphere, the mid-17th century experienced almost unprecedented death rates. Geoffrey Parker, a British historian, suggests that environmental factors may have been in part to blame, especially global cooling.

The "absolute" rule of powerful monarchs such as Louis XIV (ruled France 1643–1715), Peter the Great (ruled Russia 1682–1725), Maria Theresa (ruled Habsburg lands 1740–1780) and Frederick the Great (ruled Prussia 1740–86), produced powerful centralized states, with strong armies and powerful bureaucracies, all under the control of the king.

Throughout the early part of this period, capitalism (through mercantilism) was replacing feudalism as the principal form of economic organisation, at least in the western half of Europe. The expanding colonial frontiers resulted in a Commercial Revolution. The period is noted for the rise of modern science and the application of its findings to technological improvements, which animated the Industrial Revolution after 1750.

The Reformation had profound effects on the unity of Europe. Not only were nations divided one from another by their religious orientation, but some states were torn apart internally by religious strife, avidly fostered by their external enemies. France suffered this fate in the 16th century in the series of conflicts known as the French Wars of Religion, which ended in the triumph of the Bourbon Dynasty. England avoided this fate for a while and settled down under Elizabeth to a moderate Anglicanism. Much of modern-day Germany was made up of numerous small sovereign states under the theoretical framework of the Holy Roman Empire, which was further divided along internally drawn sectarian lines. The Polish–Lithuanian Commonwealth is notable in this time for its religious indifference and a general immunity to the horrors of European religious strife.

The Thirty Years' War was fought between 1618 and 1648, across Germany and neighboring areas, and involved most of the major European powers except England and Russia. Beginning as a religious conflict between Protestants and Catholics in Bohemia, it quickly developed into a general war involving Catholics versus Protestants for the most part. The major impact of the war, in which mercenary armies were extensively used, was the devastation of entire regions scavenged bare by the foraging armies. Episodes of widespread famine and disease, and the breakup of family life, devastated the population of the German states and, to a lesser extent, the Low Countries, Bohemia and Italy, while bankrupting many of the regional powers involved. Between one-fourth and one-third of the German population perished from direct military causes or from disease and starvation, as well as postponed births.

After the Peace of Westphalia, which ended the war in favour of nations deciding their own religious allegiance, absolutism became the norm of the continent, while parts of Europe experimented with constitutions foreshadowed by the English Civil War and particularly the Glorious Revolution. European military conflict did not cease, but had less disruptive effects on the lives of Europeans. In the advanced northwest, the Enlightenment gave a philosophical underpinning to the new outlook, and the continued spread of literacy, made possible by the printing press, created new secular forces in thought.

From the Union of Krewo (1385) central and eastern Europe was dominated by Kingdom of Poland and Grand Duchy of Lithuania. In the 16th and 17th centuries Central and Eastern Europe was an arena of conflict for domination of the continent between Sweden, the Polish–Lithuanian Commonwealth and the Ottoman Empire. The Polish–Lithuanian Commonwealth continued dominance central and eastern Europe until series of wars: Khmelnytsky Uprising, Russo-Polish War and the Deluge. This period saw a gradual decline of these three powers which were eventually replaced by new enlightened absolutist monarchies: Russia, Prussia and Austria. By the turn of the 19th century they had become new powers, having divided Poland between themselves, with Sweden and Turkey having experienced substantial territorial losses to Russia and Austria respectively as well as pauperisation.

The War of the Spanish Succession (1701–1715) was a major war with France opposed by a coalition of England, the Netherlands, the Austrian Empire, and Prussia. Duke of Marlborough commander the English and Dutch victory at the Battle Blenheim in 1704. The main issue was whether France under King Louis XIV would take control of Spain's very extensive possessions and thereby become by far the dominant power, or be forced to share power with other major nations. After initial allied successes, the long war produced a military stalemate and ended with the Treaty of Utrecht, which was based on a balance of power in Europe. Historian Russell Weigley argues that the many wars almost never accomplished more than they cost. British historian G. M. Trevelyan argues:

Frederick the Great, king of Prussia 1740–86, modernized the Prussian army, introduced new tactical and strategic concepts, fought mostly successful wars and doubled the size of Prussia. Frederick had a rationale based on Enlightenment thought: he fought total wars for limited objectives. The goal was to convince rival kings that it was better to negotiate and make peace than to fight him.

Russia with its numerous wars and rapid expansion was in a continuous state of financial crisis, which it covered by borrowing from Amsterdam and issuing paper money that caused inflation. Russia boasted a large and powerful army, a very large and complex internal bureaucracy, and a splendid court that rivaled Paris and London. However the government was living far beyond its means and seized Church lands, leaving organized religion in a weak condition. Throughout the 18th century Russia remained "a poor, backward, overwhelmingly agricultural, and illiterate country."

The "Enlightenment" was a powerful, widespread cultural movement of intellectuals beginning in late 17th-century Europe emphasizing the power of reason rather than tradition; it was especially favourable to science (especially Isaac Newton's physics) and hostile to religious orthodoxy (especially of the Catholic Church). It sought to analyze and reform society using reason, to challenge ideas grounded in tradition and faith, and to advance knowledge through the scientific method. It promoted scientific thought, skepticism, and intellectual interchange. The Enlightenment was a revolution in human thought. This new way of thinking was that rational thought begins with clearly stated principles, uses correct logic to arrive at conclusions, tests the conclusions against evidence, and then revises the principles in the light of the evidence.

Enlightenment thinkers opposed superstition. Some Enlightenment thinkers collaborated with Enlightened despots, absolutist rulers who attempted to forcibly impose some of the new ideas about government into practice. The ideas of the Enlightenment exerted significant influence on the culture, politics, and governments of Europe.

Originating in the 17th century, it was sparked by philosophers Francis Bacon (1562–1626), Baruch Spinoza (1632–1677), John Locke (1632–1704), Pierre Bayle (1647–1706), Voltaire (1694–1778), Francis Hutcheson, (1694–1746), David Hume (1711–1776) and physicist Isaac Newton (1643–1727). Ruling princes often endorsed and fostered these figures and even attempted to apply their ideas of government in what was known as enlightened absolutism. The Scientific Revolution is closely tied to the Enlightenment, as its discoveries overturned many traditional concepts and introduced new perspectives on nature and man's place within it. The Enlightenment flourished until about 1790–1800, at which point the Enlightenment, with its emphasis on reason, gave way to Romanticism, which placed a new emphasis on emotion; a Counter-Enlightenment began to increase in prominence. The Romantics argued that the Enlightenment was reductionistic insofar as it had largely ignored the forces of imagination, mystery, and sentiment.

In France, Enlightenment was based in the salons and culminated in the great "Encyclopédie" (1751–72) edited by Denis Diderot (1713–1784) and (until 1759) Jean le Rond d'Alembert (1717–1783) with contributions by hundreds of leading intellectuals who were called "philosophes", notably Voltaire (1694–1778), Rousseau (1712–1778) and Montesquieu (1689–1755). Some 25,000 copies of the 35 volume encyclopedia were sold, half of them outside France. These new intellectual strains would spread to urban centres across Europe, notably England, Scotland, the German states, the Netherlands, Poland, Russia, Italy, Austria, and Spain, as well as Britain's American colonies.

The political ideals of the Enlightenment influenced the American Declaration of Independence, the United States Bill of Rights, the French Declaration of the Rights of Man and of the Citizen, and the Polish–Lithuanian Constitution of 3 May 1791.

Taking a long-term historical perspective, Norman Davies has argued that Freemasonry was a powerful force on behalf of Liberalism and Enlightenment ideas in Europe, from about 1700 to the 20th century. It expanded rapidly during the Age of Enlightenment, reaching practically every country in Europe. Prominent members included Montesquieu, Voltaire, Sir Robert Walpole, Wolfgang Amadeus Mozart, Johann Wolfgang von Goethe, Benjamin Franklin, and George Washington. Steven C. Bullock notes that in the late 18th century, English lodges were headed by the Prince of Wales, Prussian lodges by king Frederick the Great, and French lodges by royal princes. Emperor Napoleon selected as Grand Master of France his own brother.

The great enemy of Freemasonry was the Roman Catholic Church, so that in countries with a large Catholic element, such as France, Italy, Austria, Spain and Mexico, much of the ferocity of the political battles involve the confrontation between supporters of the Church versus active Masons. 20th-century totalitarian movements, especially the Fascists and Communists, crushed the Freemasons.

The "long 19th century", from 1789 to 1914 saw the drastic social, political and economic changes initiated by the Industrial Revolution, the French Revolution and the Napoleonic Wars. Following the reorganisation of the political map of Europe at the Congress of Vienna in 1815, Europe experienced the rise of Nationalism, the rise of the Russian Empire and the peak of the British Empire, which was paralleled by the decline of the Ottoman Empire. Finally, the rise of the German Empire and the Austro-Hungarian Empire initiated the course of events that culminated in the outbreak of the First World War in 1914.

The Industrial Revolution was a period in the late 18th century and early 19th century when major changes in agriculture, manufacturing, and transport affected socioeconomic and cultural conditions in Britain and subsequently spread throughout Europe and North America and eventually the world, a process that continues as industrialisation. Technological advancements, most notably the invention of the steam engine by Scottish engineer James Watt, were major catalysts in the industrialisation of Britain and, later, the wider world. It started in England and Scotland in the mid-18th century with the mechanisation of the textile industries, the development of iron-making techniques and the increased use of refined coal. Trade expansion was enabled by the introduction of canals, improved roads and railways. The introduction of steam power (fuelled primarily by coal) and powered machinery (mainly in textile manufacturing) underpinned the dramatic increases in production capacity. The development of all-metal machine tools in the first two decades of the 19th century facilitated the manufacture of more production machines for manufacturing in other industries. The effects spread throughout Western Europe and North America during the 19th century, eventually affecting most of the world. The impact of this change on society was enormous.

Historians R.R. Palmer and Joel Colton argue:

The era of the French Revolution and the subsequent Napoleonic wars was a difficult time for monarchs. Tsar Paul I of Russia was assassinated; King Louis XVI of France was executed, as was his queen Marie Antoinette. Furthermore, kings Charles IV of Spain, Ferdinand VII of Spain and Gustav IV Adolf of Sweden were deposed as were ultimately the Emperor Napoleon and all of the relatives he had installed on various European thrones. King Frederick William III of Prussia and Emperor Francis II of Austria barely clung to their thrones. King George III of England lost the better part of his empire.

The American Revolution (1775–1783) was the first successful revolt of a colony against a European power. It proclaimed, in the words of Thomas Jefferson, that "all men are created equal," a position based on the principles of the Enlightenment. It rejected aristocracy and established a republican form of government under George Washington that attracted worldwide attention.

The French Revolution (1789–1804) was a product of the same democratic forces in the Atlantic World and had an even greater impact. French historian François Aulard says:

French intervention in the American Revolutionary War had nearly bankrupted the state. After repeated failed attempts at financial reform, King Louis XVI had to convene the Estates-General, a representative body of the country made up of three estates: the clergy, the nobility, and the commoners. The third estate, joined by members of the other two, declared itself to be a National Assembly and swore an oath not to dissolve until France had a constitution and created, in July, the National Constituent Assembly. At the same time the people of Paris revolted, famously storming the Bastille prison on 14 July 1789.

At the time the assembly wanted to create a constitutional monarchy, and over the following two years passed various laws including the Declaration of the Rights of Man and of the Citizen, the abolition of feudalism, and a fundamental change in the relationship between France and Rome. At first the king agreed with these changes and enjoyed reasonable popularity with the people. As anti-royalism increased along with threat of foreign invasion, the king tried to flee and join France's enemies. He was captured and on 21 January 1793, having been convicted of treason, he was guillotined.

On 20 September 1792 the National Convention abolished the monarchy and declared France a republic. Due to the emergency of war, the National Convention created the Committee of Public Safety, controlled by Maximilien de Robespierre of the Jacobin Club, to act as the country's executive. Under Robespierre, the committee initiated the Reign of Terror, during which up to 40,000 people were executed in Paris, mainly nobles and those convicted by the Revolutionary Tribunal, often on the flimsiest of evidence. Internal tensions at Paris drove the Committee towards increasing assertions of radicalism and increasing suspicions, fueling new terror: A few months into this phase, more and more prominent revolutionaries were being sent to the guillotine by Robespierre and his faction, for example Madame Roland and Georges Danton. Elsewhere in the country, counter-revolutionary insurrections were brutally suppressed. The regime was overthrown in the coup of 9 Thermidor (27 July 1794) and Robespierre was executed. The regime which followed ended the Terror and relaxed Robespierre's more extreme policies.

Napoleon Bonaparte was one of the world's most famous soldiers and statesmen, leading France to great victories over numerous European enemies. Despite modest origins he became Emperor and restructured much of European diplomacy, politics and law, until he was forced to abdicate in 1814. His 100-day comeback in 1815 failed at the Battle of Waterloo, and he died in exile on a remote island, remembered as a great hero by many Frenchmen and as a great villain by British and other enemies.

Napoleon, despite his youth, was France's most successful general in the Revolutionary wars, having conquered large parts of Italy and forced the Austrians to sue for peace. In 1799 on 18 Brumaire (9 November) he overthrew the feeble government, replacing it with the Consulate, which he dominated. He gained popularity in France by restoring the Church, keeping taxes low, centralizing power in Paris, and winning glory on the battlefield. In 1804 he crowned himself Emperor. In 1805, Napoleon planned to invade Britain, but a renewed British alliance with Russia and Austria (Third Coalition), forced him to turn his attention towards the continent, while at the same time the French fleet was demolished by the British at the Battle of Trafalgar, ending any plan to invade Britain. On 2 December 1805, Napoleon defeated a numerically superior Austro-Russian army at Austerlitz, forcing Austria's withdrawal from the coalition (see Treaty of Pressburg) and dissolving the Holy Roman Empire. In 1806, a Fourth Coalition was set up. On 14 October Napoleon defeated the Prussians at the Battle of Jena-Auerstedt, marched through Germany and defeated the Russians on 14 June 1807 at Friedland. The Treaties of Tilsit divided Europe between France and Russia and created the Duchy of Warsaw.

On 12 June 1812 Napoleon invaded Russia with a Grande Armée of nearly 700,000 troops. After the measured victories at Smolensk and Borodino Napoleon occupied Moscow, only to find it burned by the retreating Russian army. He was forced to withdraw. On the march back his army was harassed by Cossacks, and suffered disease and starvation. Only 20,000 of his men survived the campaign. By 1813 the tide had begun to turn from Napoleon. Having been defeated by a seven nation army at the Battle of Leipzig in October 1813, he was forced to abdicate after the Six Days' Campaign and the occupation of Paris. Under the Treaty of Fontainebleau he was exiled to the island of Elba. He returned to France on 1 March 1815 (see Hundred Days), raised an army, but was finally defeated by a British and Prussian force at the Battle of Waterloo on 18 June 1815 and exiled to a small British island in the South Atlantic.

Roberts finds that the Revolutionary and Napoleonic wars, from 1793 to 1815, caused 4 million deaths (of whom 1 million were civilians); 1.4 million were French deaths.

Outside France the Revolution had a major impact. Its ideas became widespread. Roberts argues that Napoleon was responsible for key ideas of the modern world, so that, "meritocracy, equality before the law, property rights, religious toleration, modern secular education, sound finances, and so on-were protected, consolidated, codified, and geographically extended by Napoleon during his 16 years of power."

Furthermore, the French armies in the 1790s and 1800s directly overthrew feudal remains in much of western Europe. They liberalised property laws, ended seigneurial dues, abolished the guild of merchants and craftsmen to facilitate entrepreneurship, legalised of divorce, closed the Jewish ghettos and made Jews equal to everyone else. The Inquisition ended as did the Holy Roman Empire. The power of church courts and religious authority was sharply reduced and equality under the law was proclaimed for all men.

In foreign affairs, the French Army down to 1812 was quite successful. Roberts says that Napoleon fought 60 battles, losing only seven. France conquered Belgium and turned it into another province of France. It conquered the Netherlands, and made it a puppet state. It took control of the German areas on the left bank of the Rhine River and set up a puppet regime. It conquered Switzerland and most of Italy, setting up a series of puppet states. The result was glory for France, and an infusion of much needed money from the conquered lands, which also provided direct support to the French Army. However the enemies of France, led by Britain and funded by the inexhaustible British Treasury, formed a Second Coalition in 1799 (with Britain joined by Russia, the Ottoman Empire and Austria). It scored a series of victories that rolled back French successes, and trapped the French Army in Egypt. Napoleon himself slipped through the British blockade in October 1799, returning to Paris, where he overthrew the government and made himself the ruler.

Napoleon conquered most of Italy in the name of the French Revolution in 1797–99. He consolidated old units and split up Austria's holdings. He set up a series of new republics, complete with new codes of law and abolition of old feudal privileges. Napoleon's Cisalpine Republic was centered on Milan; Genoa became a republic; the Roman Republic was formed as well as the small Ligurian Republic around Genoa. The Neapolitan Republic was formed around Naples, but it lasted only five months. He later formed the Kingdom of Italy, with his brother as King. In addition, France turned the Netherlands into the Batavian Republic, and Switzerland into the Helvetic Republic. All these new countries were satellites of France, and had to pay large subsidies to Paris, as well as provide military support for Napoleon's wars. Their political and administrative systems were modernized, the metric system introduced, and trade barriers reduced. Jewish ghettos were abolished. Belgium and Piedmont became integral parts of France.

Most of the new nations were abolished and returned to prewar owners in 1814. However, Artz emphasizes the benefits the Italians gained from the French Revolution:

Likewise in Switzerland the long-term impact of the French Revolution has been assessed by Martin:

The greatest impact came of course in France itself. In addition to effects similar to those in Italy and Switzerland, France saw the introduction of the principle of legal equality, and the downgrading of the once powerful and rich Catholic Church to just a bureau controlled by the government. Power became centralized in Paris, with its strong bureaucracy and an army supplied by conscripting all young men. French politics were permanently polarized – new names were given, "left" and "right" for the supporters and opponents of the principles of the Revolution.

British historian Max Hastings says there is no question that as a military genius Napoleon ranks with Alexander the Great and Julius Caesar in greatness. However, in the political realm, historians debate whether Napoleon was "an enlightened despot who laid the foundations of modern Europe or, instead, a megalomaniac who wrought greater misery than any man before the coming of Hitler".

Historian Kenneth Scott Latourette argues that the outlook for Protestantism at the start of the 19th century was discouraging. It was a regional religion based in northwestern Europe, with an outpost in the sparsely settled United States. It was closely allied with government, as in Scandinavia, the Netherlands, Prussia, and especially Great Britain. The alliance came at the expense of independence, as the government made the basic policy decisions, down to such details as the salaries of ministers and location of new churches. The dominant intellectual currents of the Enlightenment promoted rationalism, and most Protestant leaders preached a sort of deism. Intellectually, the new methods of historical and anthropological study undermine automatic acceptance of biblical stories, as did the sciences of geology and biology. Industrialization was a strongly negative factor, as workers who moved to the city seldom joined churches. The gap between the church and the unchurched grew rapidly, and secular forces, based both in socialism and liberalism undermine the prestige of religion. Despite the negative forces, Protestantism demonstrated a striking vitality by 1900. Shrugging off Enlightenment rationalism, Protestants embraced romanticism, with the stress on the personal and the invisible. Entirely fresh ideas as expressed by Friedrich Schleiermacher, Soren Kierkegaard, Albrecht Ritschl and Adolf von Harnack restored the intellectual power of theology. There was more attention to historic creeds such as the Augsburg, the Heidelberg, and the Westminster confessions. In England, Anglicans emphasize the historically Catholic components of their heritage, as the High Church element reintroduced vestments and incense into their rituals. The stirrings of pietism on the Continent, and evangelicalism in Britain expanded enormously, leading the devout away from an emphasis on formality and ritual and toward an inner sensibility toward personal relationship to Christ. Social activities, in education and in opposition to social vices such as slavery, alcoholism and poverty provided new opportunities for social service. Above all, worldwide missionary activity became a highly prized goal, proving quite successful in close cooperation with the imperialism of the British, German, and Dutch empires.

The political development of nationalism and the push for popular sovereignty culminated with the ethnic/national revolutions of Europe. During the 19th century nationalism became one of the most significant political and social forces in history; it is typically listed among the top causes of World War I.

Napoleon's conquests of the German and Italian states around 1800–1806 played a major role in stimulating nationalism and the demands for national unity.

In the German states east of Prussia Napoleon abolished many of the old or medieval relics, such as dissolving the Holy Roman Empire in 1806. He imposed rational legal systems and demonstrated how dramatic changes were possible. For example, his organization of the Confederation of the Rhine in 1806 promoted a feeling of nationalism. Nationalists sought to encompass masculinity in their quest for strength and unity. In the 1860s it was Prussian chancellor Otto von Bismarck who achieved German unification in 1870 after the many smaller states followed Prussia's leadership in wars against Denmark, Austria and France.

Italian nationalism emerged in the 19th century and was the driving force for Italian unification or the "Risorgimento" (meaning the Resurgence or revival). It was the political and intellectual movement that consolidated different states of the Italian peninsula into the single state of the Kingdom of Italy in 1860. The memory of the Risorgimento is central to both Italian nationalism and Italian historiography.

The Greek drive for independence from the Ottoman Empire inspired supporters across Christian Europe, especially in Britain. France, Russia and Britain intervened to make this nationalist dream become reality.

For centuries the Orthodox Christian Serbs were ruled by the Muslim-controlled Ottoman Empire. The success of the Serbian revolution against Ottoman rule in 1817 marked the foundation of modern Principality of Serbia. It achieved "de facto" independence in 1867 and finally gained recognition by the Great Powers in the Berlin Congress of 1878. The Serbs developed a larger vision for nationalism in Pan-Slavism and with Russian support sought to pull the other Slavs out of the Austro-Hungarian Empire. Austria, with German backing, tried to crush Serbia in 1914 but Russia intervened, thus igniting the First World War in which Austria dissolved into nation states.

In 1918, the region of Vojvodina proclaimed its secession from Austria-Hungary to unite with the pan-Slavic State of Slovenes, Croats and Serbs; the Kingdom of Serbia joined the union on 1 December 1918, and the country was named Kingdom of Serbs, Croats, and Slovenes. It was renamed Yugoslavia, which was never able to tame the multiple nationalities and religions and it flew apart in civil war in the 1990s.

Bulgarian nationalism emerged under Ottoman rule in the late 18th and early 19th century, under the influence of western ideas such as liberalism and nationalism, which trickled into the country after the French revolution, mostly via Greece, although there were stirrings in the 18th century. Russia, as fellow Orthodox Slavs, could appeal to the Bulgarians in a way that Austria could not. An autonomous Bulgarian Exarchate was established for the dioceses of Bulgaria as well as those, wherein at least two thirds of Orthodox Christians were willing to join it. The April Uprising in 1876 indirectly resulted in the re-establishment of Bulgaria in 1878.

The cause of Polish nationalism was repeatedly frustrated before 1918. In the 1790s, Germany, Russia and Austria partitioned Poland. Napoleon set up the Duchy of Warsaw, a new Polish state that ignited a spirit of nationalism. Russia took it over in 1815 as Congress Poland with the tsar as King of Poland. Large-scale nationalist revolts erupted in 1830 and 1863–64 but were harshly crushed by Russia, which tried to Russify the Polish language, culture and religion. The collapse of the Russian Empire in the First World War enabled the major powers to reestablish an independent Poland, which survived until 1939. Meanwhile, Poles in areas controlled by Germany moved into heavy industry but their religion came under attack by Bismarck in the Kulturkampf of the 1870s. The Poles joined German Catholics in a well-organized new Centre Party, and defeated Bismarck politically. He responded by stopping the harassment and cooperating with the Centre Party.

An important component of nationalism was the study of the nation's heritage, emphasizing the national language and literary culture. The stimulated, and was in turn strongly supported by the emergence of national educational systems reaching the general population. Latin gave way to the national language, and compulsory education, with strong support from modernizers and the media, became standard throughout Western countries. Voting reforms extended the franchise to previously uneducated element, and a strong sentiment among the elites so necessity for compulsory public education so that the new electorate could understand and handle its duties. Every country developed a sense of national origins – the historical accuracy was less important than the motivation toward patriotism. Universal compulsory education was extended as well to girls, at least at the elementary level. By the 1890s, strong movements emerged in some countries, including France, Germany and the United States, to extend compulsory education to the secondary level.
After the defeat of revolutionary France, the other great powers tried to restore the situation which existed before 1789. In 1815 at the Congress of Vienna, the major powers of Europe managed to produce a peaceful balance of power among the various European empires. This was known as the Metternich system. The powerbase of their support was the aristocracy, with its great landed wealth and control of the government, the church, and the military in most countries. However, their efforts were unable to stop the spread of revolutionary movements: the middle classes had been deeply influenced by the ideals of the French revolution, the Industrial Revolution brought important economical and social changes.

Radical intellectuals looked to the working classes for a base for socialist, communist and anarchistic ideas. Widely influential was the 1848 pamphlet by Karl Marx and Friedrich Engels "The Communist Manifesto".

The middle classes and businessmen promoted liberalism, free trade and capitalism. Aristocratic elements concentrated in government service, the military and the established churches. Nationalist movements (in Germany, Italy, Poland, Hungary, and elsewhere) called upon the "racial" unity (which usually meant a common language and an imagined common ethnicity) to seek national unification and/or liberation from foreign rule. As a result, the period between 1815 and 1871 saw a large number of revolutionary attempts and independence wars. Greece successfully revolted against Ottoman rule in the 1820s. European diplomats and intellectuals saw the Greek struggle for independence, with its accounts of Turkish atrocities, in a romantic light.

Napoleon III, nephew of Napoleon I, returned to France from exile in 1848, bringing a famous name that promised to stabilize the chaotic political situation. He was elected president and elected himself Emperor, a move approved later by a large majority of the French electorate. He modernized Paris, and build up the economy. He was most famous for his aggressive foreign policy in Europe, Mexico, and worldwide. He helped in the unification of Italy by fighting the Austrian Empire and joined the Crimean War on the side of the United Kingdom and the Ottoman Empire against Russia. His empire collapsed after being defeated in the Franco-Prussian War. France gave up monarchs and became the democratic but anti-clerical French Third Republic, which lasted until 1940.

Most European states had become constitutional (rather than absolute) monarchies by 1871, and Germany and Italy merged many small city-states to become united nation-states. Germany in particular increasingly dominated the continent in terms of economics and political power. Meanwhile, on a global scale, Great Britain, with its far-flung British Empire, unmatched Royal Navy, and powerful bankers, became the world's first global power. The sun never set on its territories, while an informal empire operated through British financiers, entrepreneurs, traders and engineers who established operations in many countries, and largely dominated Latin America. The British were especially famous for financing and constructing railways around the world.

From his base in Prussia, Otto von Bismarck in the 1860s engineered a series of short, decisive wars, that unified most of the German states (excluding Austria) into a powerful German Empire under Prussian leadership. He humiliated France in the process, but kept on good terms with Austria-Hungary. With that accomplished by 1871 he then skillfully used balance of power diplomacy to preserve Germany's new role and keep Europe at peace. He was removed from office in 1890 by an aggressive young Kaiser Wilhelm II, who pursued a disruptive foreign policy that polarized Europe into rival camps. These rival camps went to war with each other in 1914.

The power of nationalism to create new states was irresistible in the 19th century, and the process could lead to collapse in the absence of a strong nationalism. Austria-Hungary had the advantage of size, but multiple disadvantages. There were rivals on four sides, its finances were unstable, the population was fragmented into multiple ethnicities and languages that served as the bases for separatist nationalisms. It had a large army with good forts, but its industrial base was thin. Its naval resources were so minimal that it did not attempt to build an overseas empire. It did have the advantage of good diplomats, typified by Metternich (Foreign Minister 1809–1848, Prime Minister, 1821–1848)). They employed a grand strategy for survival that balanced out different forces, set up buffer zones, and kept the Habsburg empire going despite wars with the Ottomans, Frederick the Great, Napoleon and Bismarck, until the final disaster of the First World War. The Empire overnight disintegrated into multiple states based on ethnic nationalism and the principle of self-determination.

The Russian Empire likewise brought together a multitude of languages and cultures, so that its military defeat in the First World War led to multiple splits that created independent Finland, Latvia, Lithuania, Estonia, and Poland, and for a brief spell, independent Ukraine, Armenia, Georgia, and Azerbaijan.

Colonial empires were the product of the European Age of Discovery from the 15th century. The initial impulse behind these dispersed maritime empires and those that followed was trade, driven by the new ideas and the capitalism that grew out of the Renaissance. Both the Portuguese Empire and Spanish Empire quickly grew into the first global political and economic systems with territories spread around the world.

Subsequent major European colonial empires included the French, Dutch, and British empires. The latter, consolidated during the period of British maritime hegemony in the 19th century, became the largest empire in history because of the improved ocean transportation technologies of the time as well as electronic communication through the telegraph, cable, and radio. At its height in 1920, the British Empire covered a quarter of the Earth's land area and comprised a quarter of its population. Other European countries, such as Belgium, Germany, and Italy, pursued colonial empires as well (mostly in Africa), but they were smaller. Ignoring the oceans, Russia built its Russian Empire through conquest by land in Eastern Europe, and Asia.

By the mid-19th century, the Ottoman Empire had declined enough to become a target for other global powers (see History of the Balkans). This instigated the Crimean War in 1854 and began a tenser period of minor clashes among the globe-spanning empires of Europe that eventually set the stage for the First World War. In the second half of the 19th century, the Kingdom of Sardinia and the Kingdom of Prussia carried out a series of wars that resulted in the creation of Italy and Germany as nation-states, significantly changing the balance of power in Europe. From 1870, Otto von Bismarck engineered a German hegemony of Europe that put France in a critical situation. It slowly rebuilt its relationships, seeking alliances with Russia and Britain to control the growing power of Germany. In this way, two opposing sides – the Triple Alliance of 1882 (Germany, Austria-Hungary and Italy) and the Triple Entente of 1907 (Britain, France and Russia) – formed in Europe, improving their military forces and alliances year-by-year.

German-American historian Konrad Jarausch, asked if he agreed that "the European record of the past century [was] just one gigantic catastrophe", argues:

The "short twentieth century", from 1914 to 1991, included the First World War, the Second World War and the Cold War. The First World War used modern technology to kill millions of soldiers. Victory by Britain, France, the United States and other allies drastically changed the map of Europe, ending four major land empires (the Russian, German, Austro-Hungarian and Ottoman empires) and leading to the creation of nation-states across Central and Eastern Europe. The October Revolution in Russia led to the creation of the Soviet Union (1917–1991) and the rise of the international communist movement. Widespread economic prosperity was typical of the period before 1914, and 1920–1929. After the onset of the Great Depression in 1929, however, democracy collapsed in most of Europe. Fascists took control in Italy, and the even more aggressive Nazi movement led by Adolf Hitler took control of Germany, 1933–45. The Second World War was fought on an even larger scale than the First war, killing many more people, and using even more advanced technology. It ended with the division of Europe between East and West, with the East under the control of the Soviet Union and the West dominated by NATO. The two sides engaged in the Cold War, with actual conflict taking place not in Europe but in Asia in the Korean War and the Vietnam War. The Imperial system collapsed. The remaining colonial empires ended through the decolonisation of European rule in Africa and Asia. The fall of Soviet Communism (1989–1991) left the West dominant and enabled the reunification of Germany. It accelerated the process of a European integration to include Eastern Europe. The European Union continues today, but with German economic dominance. Since the worldwide Great Recession of 2008, European growth has been slow, and financial crises have hit Greece and other countries. Social divisiveness has been caused by large-scale immigration and radical Islamic rejection of European norms. While Russia is a weak version of the old Soviet Union, it has been confronting Europe in Ukraine and other areas.

After the relative peace of most of the 19th century, the rivalry between European powers, compounded by a rising nationalism among ethnic groups, exploded in August 1914, when the First World War started. Over 65 million European soldiers were mobilised from 1914 to 1918; 20 million soldiers and civilians died, and 21 million were seriously wounded. On one side were Germany, Austria-Hungary, the Ottoman Empire and Bulgaria (the Central Powers/Triple Alliance), while on the other side stood Serbia and the "Triple Entente" – the coalition of France, Britain and Russia, which were joined by Italy in 1915, Romania in 1916 and by the United States in 1917. The Western Front involved especially brutal combat without any territorial gains by either side. Single battles like Verdun and the Somme killed hundreds of thousands of men while leaving the stalemate unchanged. Heavy artillery and machine guns caused most of the casualties, supplemented by poison gas. Czarist Russia collapsed in the February Revolution of 1917 and Germany claimed victory on the Eastern Front. After eight months of liberal rule, the October Revolution brought Vladimir Lenin and the Bolsheviks to power, leading to the creation of the Soviet Union in place of the disintegrated Russian Empire. With American entry into the war in 1917 on the Allied side, and the failure of Germany's spring 1918 offensive, Germany had run out of manpower, while an average of 10,000 American troops were arriving in France every day in the summer of 1918. Germany's allies, Austria-Hungary and the Ottoman Empire, surrendered and dissolved, followed by Germany on 11 November 1918. The victors forced Germany to assume responsibility for the conflict and pay war reparations.

One factor in determining the outcome of the war was that the Allies had significantly more economic resources they could spend on the war. One estimate (using 1913 US dollars) is that the Allies spent $58 billion on the war and the Central Powers only $25 billion. Among the Allies, Britain spent $21 billion and the U.S. $17 billion; among the Central Powers Germany spent $20 billion.

The world war was settled by the victors at the Paris Peace Conference in 1919. Two dozen nations sent delegations, and there were many nongovernmental groups, but the defeated powers were not invited.

The "Big Four" were President Woodrow Wilson of the United States, Prime Minister David Lloyd George of Great Britain, Georges Clemenceau of France, and, of least importance, Italian Prime Minister Vittorio Orlando. They met together informally 145 times and made all the major decisions, which in turn were ratified by the others.

The major decisions were the creation of the League of Nations; the six peace treaties with defeated enemies, most notable the Treaty of Versailles with Germany; the awarding of German and Ottoman overseas possessions as "mandates", chiefly to Britain and France; and the drawing of new national boundaries (sometimes with plebiscites) to better reflect the forces of nationalism.

As the conference's decisions were enacted unilaterally, and largely on the whims of the Big Four, for its duration Paris was effectively the center of a world government, which deliberated over and implemented the sweeping changes to the political geography of Europe. Most famously, the Treaty of Versailles itself weakened Germany's military power and placed full blame for the war and costly reparations on its shoulders – the humiliation and resentment in Germany is sometimes considered as one of the causes of Nazi success and indirectly a cause of World War II.

At the insistence of President Wilson, the Big Four required Poland to sign a treaty on 28 June 1919 that guaranteed minority rights in the new nation. Poland signed under protest, and made little effort to enforce the specified rights for Germans, Jews, Ukrainians, and other minorities. Similar treaties were signed by Czechoslovakia, Romania, Yugoslavia, Greece, Austria, Hungary, Bulgaria, and later by Latvia, Estonia and Lithuania. Finland and Germany were not asked to sign a minority rights treaty.

In the Treaty of Versailles (1919) the winners imposed relatively hard conditions on Germany and recognised the new states (such as Poland, Czechoslovakia, Hungary, Austria, Yugoslavia, Finland, Estonia, Latvia, Lithuania) created in central Europe from the defunct German, Austro-Hungarian and Russian empires, based on national (ethnic) self-determination. It was a peaceful era with a few small wars before 1922 such as the Ukrainian–Soviet War (1917–1921) and the Polish–Soviet War (1919–1921). Prosperity was widespread, and the major cities sponsored a youth culture called the "Roaring Twenties" that was often featured in the cinema, which attracted very large audiences.

The Allied victory in the First World War seem to mark the triumph of liberalism, not just in the Allied countries themselves, but also in Germany and in the new states of Eastern Europe, as well as Japan. Authoritarian militarism as typified by Germany had been defeated and discredited. Historian Martin Blinkhorn argues that the liberal themes were ascendant in terms of "cultural pluralism, religious and ethnic toleration, national self-determination, free-market economics, representative and responsible government, free trade, unionism, and the peaceful settlement of international disputes through a new body, the League of Nations." However, as early as 1917, the emerging liberal order was being challenged by the new communist movement taking inspiration from the Russian Revolution. Communist revolts were beaten back everywhere else, but they did succeed in Russia.

Italy adopted an authoritarian system known as Fascism in 1922; it became a model for Hitler in Germany and for right wing elements in other countries. Historian Stanley G. Payne says Fascism in Italy was:

Authoritarian regimes were established in the 1930s in Germany, Portugal, Austria, Poland, Greece, the Baltic countries and Spain. By 1940, there were only four liberal democracies left on the European continent: France, Finland, Switzerland and Sweden.

After the Wall Street Crash of 1929, nearly the whole world sank into a Great Depression, as prices fell, profits fell, and unemployment soared. The worst hit sectors included heavy industry, export-oriented agriculture, mining and lumbering, and construction. World trade fell by two thirds.

Liberalism and democracy were discredited. In most of Europe, as well as in Japan and most of Latin America, nation after nation turned to dictators and authoritarian regimes. The most momentous change of government came when Hitler and his Nazis took power in Germany in 1933. A major civil war took place in Spain, with the nationalists winning. The League of Nations was helpless as Italy conquered Ethiopia and Japan seized Manchuria in 1931 and took over most of China starting in 1937.

The Spanish Civil War (1936–1939) was marked by numerous small battles and sieges, and many atrocities, until the rebels (the Nationalists), led by Francisco Franco, won in 1939. There was military intervention as Italy sent land forces, and Germany sent smaller elite air force and armoured units to the Nationalists. The Soviet Union sold armaments to the leftist Republicans on the other side, while the Communist parties in numerous countries sent soldiers to the "International Brigades." The civil war did not escalate into a larger conflict, but did become a worldwide ideological battleground that pitted the left, the communist movement and many liberals against Catholics, conservatives, and fascists. Britain, France and the US remained neutral and refused to sell military supplies to either side. Worldwide there was a decline in pacifism and a growing sense that another world war was imminent, and that it would be worth fighting for.

In the Munich Agreement of 1938, Britain and France adopted a policy of appeasement as they gave Hitler what he wanted out of Czechoslovakia in the hope that it would bring peace. It did not. In 1939 Germany took over the rest of Czechoslovakia and appeasement policies gave way to hurried rearmament as Hitler next turned his attention to Poland.

After allying with Japan in the Anti-Comintern Pact and then also with Benito Mussolini's Italy in the "Pact of Steel", and finally signing a non-aggression treaty with the Soviet Union in August 1939, Hitler launched the Second World War on 1 September 1939 by attacking Poland. To his surprise Britain and France declared war on Germany, but there was little fighting during the "Phoney War" period. War began in earnest in spring 1940 with the successful Blitzkrieg conquests of Denmark, Norway, the Low Countries, and France. Britain remained alone but refused to negotiate, and defeated Germany's air attacks in the Battle of Britain. Hitler's goal was to control Eastern Europe but because of his failure to defeat Britain and the Italian failures in North Africa and the Balkans, the great attack on the Soviet Union was delayed until June 1941. Despite initial successes, the German army was stopped close to Moscow in December 1941.

Over the next year the tide was turned and the Germans started to suffer a series of defeats, for example in the siege of Stalingrad and at Kursk. Meanwhile, Japan (allied to Germany and Italy since September 1940) attacked Britain and the United States on 7 December 1941; Germany then completed its over-extension by declaring war on the United States. War raged between the Axis Powers (Germany, Italy, and Japan) and the Allied Forces (British Empire, Soviet Union, and the United States). The Allied Forces won in North Africa, invaded Italy in 1943, and recaptured France in 1944. In the spring of 1945 Germany itself was invaded from the east by the Soviet Union and from the west by the other Allies. As the Red Army conquered the Reichstag in Berlin, Hitler committed suicide and Germany surrendered in early May. World War II was the deadliest conflict in human history, causing between 50 and 80 million deaths, the majority of whom were civilians (approximately 38 to 55 million).

This period was also marked by systematic genocide. In 1942–45, separately from the war-related deaths, the Nazis killed an additional number of over 11 million civilians identified through IBM-enabled censuses, including the majority of the Jews and Gypsies of Europe, millions of Polish and Soviet Slavs, and also homosexuals, Jehovah's Witnesses, misfits, disabled, and political enemies. Meanwhile, in the 1930s the Soviet system of forced labour, expulsions and allegedly engineered famine had a similar death toll. During and after the war millions of civilians were affected by forced population transfers.

The world wars ended the pre-eminent position of Britain, France and Germany in Europe and the world. At the Yalta Conference, Europe was divided into spheres of influence between the victors of World War II, and soon became the principal zone of contention in the Cold War between the two power blocs, the Western countries and the Communist bloc. The United States and the majority of European liberal democracies at the time (United Kingdom, France, Italy, Netherlands, West Germany etc.) established the NATO military alliance. Later, the Soviet Union and its satellites (Bulgaria, Czechoslovakia, East Germany, Hungary, Poland, and Romania) in 1955 established the Warsaw Pact as a counterpoint to NATO. The Warsaw Pact had a much larger ground force, but the American-French-British nuclear umbrellas protected NATO.

Communist states were imposed by the Red Army in the East, while parliamentary democracy became the dominant form of government in the West. Most historians point to its success as the product of exhaustion with war and dictatorship, and the promise of continued economic prosperity. Martin Conway also adds that an important impetus came from the anti-Nazi wartime political coalitions.

The United States gave away about $20 billion in Marshall Plan grants and other grants and low-interest long-term loans to Western Europe, 1945 to 1951. Historian Michael J. Hogan argues that American aid was critical in stabilizing the economy and politics of Western Europe. It brought in modern management that dramatically increased productivity, and encouraged cooperation between labor and management, and among the member states. Local Communist parties were opposed, and they lost prestige and influence and a role in government. In strategic terms, says Hogan, the Marshall Plan strengthened the West against The possibility of a Communist invasion or political takeover. However, the Marshall Plan's role in the rapid recovery has been debated. Most reject the idea that it only miraculously revived Europe, since the evidence shows that a general recovery was already under way thanks to other aid programs from the United States. Economic historians Bradford De Long and Barry Eichengreen conclude it was, " History's Most Successful Structural Adjustment Program." They state:

The Soviet Union concentrated on its own recovery. It seized and transferred most of Germany's industrial plants and it exacted war reparations from East Germany, Hungary, Romania, and Bulgaria, using Soviet-dominated joint enterprises. It used trading arrangements deliberately designed to favor the Soviet Union. Moscow controlled the Communist parties that ruled the satellite states, and they followed orders from the Kremlin. Historian Mark Kramer concludes:

Western Europe began economic and then political integration, with the aim to unite the region and defend it. This process included organisations such as the European Coal and Steel Community, which grew and evolved into the European Union, and the Council of Europe. The Solidarność movement in the 1980s weakened the Communist government in Poland. At the time the Soviet leader Mikhail Gorbachev initiated perestroika and glasnost, which weakened Soviet influence in Europe, particularly in the USSR. In 1989 the Berlin Wall came down and Communist governments outside the Soviet Union were deposed. In 1990 the Federal Republic of Germany absorbed East Germany, after making large cash payments to the USSR. In 1991 the Communist Party in Moscow collapsed, ending the USSR, which split into fifteen independent states. The largest, Russia, took the Soviet Union's seat on the United Nations Security Council. The most violent dissolution happened in Yugoslavia, in the Balkans. Four (Slovenia, Croatia, Bosnia and Herzegovina and Macedonia) out of six Yugoslav republics declared independence and for most of them a violent war ensued, in some parts lasting until 1995. In 2006 Montenegro seceded and became an independent state. In the post–Cold War era, NATO and the EU have been gradually admitting most of the former members of the Warsaw Pact.

Looking at the half century after the war historian Walter Lacquer concluded:

The post-war period also witnessed a significant rise in the standard of living of the Western European working class. As noted by one historical text, "within a single generation, the working classes of Western Europe came to enjoy the multiple pleasures of the consumer society."

Western Europe's industrial nations in the 1970s were hit by a global economic crisis. They had obsolescent heavy industry, and suddenly had to pay very high energy prices which caused sharp inflation. Some of them also had inefficient nationalized railways and heavy industries. In the important field of computer technology, European nations lagged behind the United States. They also faced high government deficits and growing unrest led by militant labour unions. There was an urgent need for new economic directions. Germany and Sweden sought to create a social consensus behind a gradual restructuring. Germany's efforts proved highly successful. In Britain under the leadership of Margaret Thatcher, the solution was shock therapy, high interest rates, austerity, and selling off inefficient corporations as well as the public housing, which was sold off to the tenants. One result was escalating social tensions in Britain, led by the militant coal miners. Thatcher eventually defeated her opponents and radically changed the British economy, but the controversy never went away as shown by the hostile demonstrations at the time of her death in 2013.

The ending of the Cold War came in a rush of events in 1979 to 1991, chiefly in Eastern Europe, that brought the end of the Soviet control over its East European satellites and its world network of communist parties (1989) and ending with the final splitting up of the Soviet Union in 1991 into 15 non-communist states. Italian historian Federico Romero reports that observers at the time emphasized that,:

Following the end of the Cold War, the European Economic Community pushed for closer integration, co-operation in foreign and home affairs, and started to increase its membership into the neutral and former communist countries. In 1993, the Maastricht Treaty established the European Union, succeeding the EEC and furthering political co-operation. The neutral countries of Austria, Finland and Sweden acceded to the EU, and those that didn't join were tied into the EU's economic market via the European Economic Area. These countries also entered the Schengen Agreement which lifted border controls between member states.

The Maastricht Treaty created a single currency for most EU members. The "euro" was created in 1999 and replaced all previous currencies in participating states in 2002. The most notable exception to the currency union, or "eurozone", was the United Kingdom, which also did not sign the Schengen Agreement.

EU did not participate in the Yugoslav Wars, and was divided on supporting the United States in the 2003–2011 Iraq War. NATO has been part of the war in Afghanistan, but at a much lower level of involvement than the United States.

In 2004, the EU gained 10 new members. (Estonia, Latvia, and Lithuania, which had been part of the Soviet Union; Czech Republic, Hungary, Poland, Slovakia, and Slovenia, five former-communist countries; Malta, and the divided island of Cyprus.) These were followed by Bulgaria and Romania in 2007. Russia's regime had interpreted these expansions as violations against NATO's promise to not expand "one inch to the east" in 1990. Russia engaged in a number of bilateral disputes about gas supplies with Belarus and Ukraine which endangered gas supplies to Europe. Russia also engaged in a minor war with Georgia in 2008.

Supported by the United States and some European countries, Kosovo's government unilaterally declared independence from Serbia on 17 February 2008.

Public opinion in the EU turned against enlargement, partially due to what was seen as over-eager expansion including Turkey gaining candidate status. The European Constitution was rejected in France and the Netherlands, and then (as the Treaty of Lisbon) in Ireland, although a second vote passed in Ireland in 2009.

The financial crisis of 2007–08 effected Europe, and government responded with austerity measures. Limited ability of the smaller EU nations (most notably Greece) to handle their debts led to social unrest, government liquidation, and financial insolvency. In May 2010, the German parliament agreed to loan 22.4 billion euros to Greece over three years, with the stipulation that Greece follow strict austerity measures. See European sovereign-debt crisis.

Beginning in 2014, Ukraine has been in a state of revolution and unrest with two breakaway regions (Donetsk and Lugansk) attempting to join Russia as full federal subjects. ("See War in Donbass.") On 16 March, a referendum was held in Crimea leading to the "de facto" secession of Crimea and its largely internationally unrecognized annexation to the Russian Federation as the Republic of Crimea.

The future of the EU was plunged into doubt in June 2016 when a United Kingdom membership referendum resulted in the country's intended withdrawal. 52% of the British voters voted to leave the EU, leading into a complex separation process implying political and economic changes for both the UK and the remaining European Union countries.

AD

Flavius Romulus Augustus (c. AD 460 – after AD 476; possibly still alive as late as AD 507), known derisively and historiographically as Romulus Augustulus, was the Roman emperor who ruled the Western Roman Empire from 31 October 475 until 4 September 476. He is often described as the "last Western Roman emperor", though some historians consider this to be Julius Nepos. His deposition by Odoacer traditionally marks the end of the Roman Empire in the West, the end of Ancient Rome, and the beginning of the Middle Ages in Western Europe.

Romulus Augustulus

Although he, as all other emperors, adopted the name Augustus upon his accession, he is better remembered by his derisive nickname "Augustulus". The Latin suffix "-ulus" is a diminutive; hence "Augustulus" effectively means "Little Augustus". The name "Romulus" was also changed derisively to "Momyllus" meaning "little disgrace".

The historical record contains few details of Romulus' life. He was the son of Orestes, a Roman who once served as a secretary in the court of Attila the Hun before coming into the service of Julius Nepos in AD 475. In the same year he was promoted to the rank of "magister militum", but then led a military revolt that forced Nepos to flee into exile. With the capital of Ravenna under his control, Orestes appointed his son Romulus to the throne despite the lack of support from the eastern court in Constantinople. Romulus, however, was little more than a child and figurehead for his father's rule. After ten months in power, during which time his authority and legitimacy were disputed beyond Italy, Romulus was forced to abdicate by Odoacer, a Germanic foederatus officer who defeated and executed Orestes. After seizing control of Ravenna, Odoacer sent the former emperor to live in the Castellum Lucullanum in Campania, after which he disappears from the historical record.

Romulus' father Orestes was a Roman citizen, originally from Pannonia, who had served as a secretary and diplomat for Attila the Hun and later rose through the ranks of the Roman army. The future emperor was named "Romulus" after his maternal grandfather, a nobleman from Poetovio in Noricum. Many historians have noted the coincidence that the last western emperor bore the names of both Romulus, the legendary founder and first king of Rome, and Augustus, the first emperor.

Orestes was appointed Magister militum by Julius Nepos in 475. Shortly after his appointment, Orestes launched a rebellion and captured Ravenna, the capital of the Western Roman Empire since 402, on 28 August 475. Nepos fled to Dalmatia, where his uncle had ruled a semi-autonomous state in the 460s. Orestes, however, refused to become emperor, "from some secret motive", said historian Edward Gibbon. Instead, he installed his son on the throne on 31 October 475.

The empire Augustus ruled was a shadow of its former self and had shrunk significantly over the previous 80 years. Imperial authority had retreated to the Italian borders and parts of southern Gaul: Italia and Gallia Narbonensis, respectively. The Eastern Roman Empire treated its western counterpart as a client state. The Eastern Emperor Leo, who died in 474, had appointed the western emperors Anthemius and Julius Nepos, and Constantinople never recognized the new government. Neither Zeno nor Basiliscus, the two generals fighting for the eastern throne at the time of Romulus' accession, accepted him as ruler.

As a proxy for his father, Romulus made no decisions and left no monuments, though coins bearing his name were minted in Rome, Milan, Ravenna, and Gaul. Several months after Orestes took power, a coalition of Heruli, Scirian and Turcilingi mercenaries demanded that he give them a third of the land in Italy. When Orestes refused, the tribes revolted under the leadership of the Scirian chieftain Odoacer. Orestes was captured near Piacenza on 28 August 476 and swiftly executed.

Odoacer advanced on Ravenna, capturing the city and the young emperor after the short and decisive Battle of Ravenna. Romulus was compelled to abdicate the throne on 4 September 476. This act has been cited as the end of the Western Roman Empire, although Romulus' deposition did not cause any significant disruption at the time. Rome had already lost its hegemony over the provinces, Germanic peoples dominated the Roman army, and Germanic generals like Odoacer had long been the real powers behind the throne. Italy would suffer far greater devastation in the next century when Emperor Justinian I reconquered it in the Gothic War.

After the abdication of Romulus, the Roman Senate, on behalf of Odoacer, sent representatives to the Eastern Roman Emperor Zeno, whom it asked to formally reunite the two halves of the Empire: "the west… no longer required an emperor of its own: one monarch sufficed for the world". He was also asked to make Odoacer a patrician, and administrator of Italy in Zeno's name. Zeno pointed out that the Senate should rightfully have first requested that Julius Nepos take the throne once more, but he nonetheless agreed to their requests. Odoacer then ruled Italy in Zeno's name.

The ultimate fate of Romulus is a mystery. The "Anonymus Valesianus" wrote that Odoacer, "taking pity on his youth" (he was about 16), spared Romulus' life and granted him an annual pension of 6,000 solidi before sending him to live with relatives in Campania. Jordanes and Marcellinus Comes say Odoacer exiled Romulus to Campania but do not mention any financial support from the Germanic king.

The sources do agree that Romulus took up residence in the Castel dell'Ovo (Lucullan Villa) in Naples, now a castle but originally built as a grand sea-side house by Lucullus in the 1st century BC, fortified by Valentinian III in the mid-5th century. From here, contemporary histories fall silent. In the "History of the Decline and Fall of the Roman Empire", Edward Gibbon notes that the disciples of Saint Severinus of Noricum were invited by a "Neapolitan lady" to bring his body to the villa in 488; Gibbon conjectures from this that Augustulus "was probably no more." The villa was converted into a monastery before 500 to hold the saint's remains.

Cassiodorus, then a secretary to Theodoric the Great, wrote a letter in 507 to a "Romulus" confirming a pension. Thomas Hodgkin, a translator of Cassiodorus' works, wrote in 1886 that it was "surely possible" the Romulus in the letter was the same person as the last western emperor. The letter would match the description of Odoacer's coup in the "Anonymus Valesianus", and Romulus could have been alive in the early sixth century. But Cassiodorus does not supply any details about his correspondent or the size and nature of his pension, and Jordanes, whose history of the period abridges an earlier work by Cassiodorus, makes no mention of a pension.

Some sources suggest that Julius Nepos claimed to hold legally the title of emperor when Odoacer took power. However, few of Nepos' contemporaries were willing to support his cause after he fled to Dalmatia. Some historians regard Julius Nepos, who ruled in Dalmatia until being murdered in 480, as the last lawful Western Roman Emperor.

Following Odoacer's coup, the Roman Senate sent a letter to Zeno stating that "the majesty of a sole monarch is sufficient to pervade and protect, at the same time, both the East and the West". While Zeno told the Senate that Nepos was their lawful sovereign, he did not press the point, and he accepted the imperial insignia brought to him by the senate.

As the last Western Roman emperor before the traditionally agreed-upon end of the Western Roman Empire, Romulus has been portrayed several times in film and literature; the play "Romulus the Great" (1950), by Friedrich Dürrenmatt, focuses on the reign of "Romulus Augustus" and the end of the Roman Empire in the West. The 2007 film "The Last Legion", and the novel on which it is based, includes a heavily fictionalized account of the reign and subsequent life of "Romulus Augustus"; escaping captivity with the aid of a small band of loyal Romans, he reaches Britain, where he eventually becomes Uther Pendragon.