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The Byzantine Empire (or Byzantium) was the Eastern Roman Empire during Late Antiquity and the Middle Ages, centered on the capital of Constantinople. Known simply as the "Roman Empire" (Greek: Βασιλεία Ῥωμαίων, Basileia Rhōmaiōn;^[2] Látìnì: Imperium Romanum) or Romania (Ῥωμανία) to its inhabitants and neighbours, it was the direct continuation of the Ancient Roman State and maintained Roman state traditions.^[3] Byzantium is today distinguished from ancient Rome proper insofar as it was oriented towards Greek culture, characterised by Christianity rather than Roman polytheism, and was predominantly Greek-speaking rather than Latin-speaking.^[3]

Βασιλεία Ῥωμαίων, Ῥωμανία Basileia Rhōmaiōn, Rhōmanía Imperium Romanum, Romania Byzantine (Eastern Roman) Empire ← 395–1453 → Flag of the Empire (14th century) Imperial emblem under the Palaiologoi The Empire at its greatest extent under Justinian in 551 AD Capital Constantinople1 Language(s) Latin – official until 620 AD Greek – official after 620 AD Religion Orthodox Christianity tolerated after the Edict of Milan in 313 and state religion after 380 Government Autocracy Emperor  - 395–408 Arcadius  - 1449–1453 Constantine XI Legislature Byzantine Senate Historical era Late Antiquity–Late Middle Ages  - Diocletian splits imperial administration between east and west 285  - Death of Theodosius I 395  - The deposition of Romulus Augustulus, nominal emperor in the west, brings formal division of the Roman Empire to an end 476  - Pope Leo III, hostile to the rule of the Empress Irene, attempts to confer imperial authority on the Frankish king Charlemagne 800  - East-West Schism 1054  - Fall of Constantinople to the Fourth Crusade 1204  - Fall of Constantinople3 29 May, 1453  - Fall of Trebizond 1461 Population  - 565 AD4 est. 26,000,000   - 780 AD est. 7,000,000   - 1025 AD4 est. 12,000,000   - 1143 AD4 est. 10,000,000   - 1282 AD est. 5,000,000  Currency Solidus, Hyperpyron Ní òní ó jẹ́ apá Countries today  Albania  Algeria  Armenia Àdàkọ:Country data Bosnia  Bulgaria  Croatia  Cyprus  Egypt  France  Georgia  Greece  Italy  Iraq  Israel  Jordan  Kosovo5  Lebanon  Libya  Macedonia  Malta  Moldova  Montenegro  Morocco  Palestine  Portugal  Romania  San Marino  Saudi Arabia  Serbia  Slovenia  Spain  Sudan  Syria  Tunisia  Turkey  Gibraltar (UK)  Ukraine  Vatican City 1 Constantinople (330–1204 and 1261–1453). The capital of the Empire of Nicaea, the empire after the Fourth Crusade, was at Nicaea, present day Iznik, Turkey. 2 Establishment date traditionally considered the re-founding of Constantinople as the capital of the Roman Empire (324/330) although other dates are often used.[1] 3Date of end universally regarded as 1453, despite the temporary survival of remnants in Morea and Trebizond.[1] 4 See Population of the Byzantine Empire for more detailed figures taken provided by McEvedy and Jones, "Atlas of World Population History", 1978, as well as Angeliki E. Laiou, "The Economic History of Byzantium", 2002. 5Àdàkọ:Kosovo-note

As the distinction between Roman Empire and Byzantine Empire is largely a modern convention, it is not possible to assign a date of separation; however, important points are the Roman Empire's administrative division into western and eastern halves in 285 by Emperor Diocletian (r. 284–305),^[4] and Emperor Constantine I's (r. 306–337) decision in 324 to transfer the capital from Nicomedia (in Asia Minor) to Byzantium on the Bosphorus, which became Constantinople, "City of Constantine" (alternatively "New Rome").^{[n 1]} The Roman Empire was finally divided in 395 AD after the death of Emperor Theodosius I (r. 379–395), thus this date is also very important if the Byzantine Empire (or Eastern Roman Empire) is looked upon as completely separated from the West. The transition to Byzantine history proper finally begins during the reign of Emperor Heraclius (r. 610–641), since Heraclius effectively established a new state after reforming the army and administration by introducing themes and by changing the official language of the Empire from Latin to Greek.^[6]

As the Western Roman Empire decayed and fragmented into numerous separate kingdoms, the Byzantine Empire continued to survive, existing for more than a thousand years from its genesis in the 4th century until the Fall of Constantinople in 1453. During most of its existence, it remained one of the most powerful economic, cultural, and military forces in Europe, despite setbacks and territorial losses, especially during the Roman–Persian and Byzantine–Arab Wars. The Empire recovered during the Macedonian dynasty, rising again to become a preeminent power in the Eastern Mediterranean by the late 10th century, rivaling the Fatimid Caliphate.

After 1071, however, much of Asia Minor, the Empire's heartland, was lost to the Seljuk Turks. The Komnenian restoration regained some ground and briefly reestablished dominance in the 12th century, but following the death of Emperor Andronikos I Komnenos (r. 1183–1185) and the end of the Komnenos dynasty in the late 12th century the Empire declined again. The Empire received a mortal blow in 1204 from the Fourth Crusade, when it was dissolved and divided into competing Byzantine Greek and Latin realms.

Despite the eventual recovery of Constantinople and re-establishment of the Empire in 1261, under the Palaiologan emperors, Byzantium remained only one of many rival states in the area for the final two centuries of its existence. However, this period was the most culturally productive time in the Empire.^[7] Successive civil wars in the 14th century further sapped the Empire's strength, and most of its remaining territories were lost in the Byzantine–Ottoman Wars, which culminated in the Fall of Constantinople and the conquest of remaining territories by the Ottoman Empire in the 15th century.

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