Byzantine Empire
Overview
 
The Byzantine Empire (or Byzantium) was the Eastern Roman Empire during the periods of Late Antiquity
Late Antiquity
Late Antiquity is a periodization used by historians to describe the time of transition from Classical Antiquity to the Middle Ages, in both mainland Europe and the Mediterranean world. Precise boundaries for the period are a matter of debate, but noted historian of the period Peter Brown proposed...

 and the Middle Ages
Middle Ages
The Middle Ages is a periodization of European history from the 5th century to the 15th century. The Middle Ages follows the fall of the Western Roman Empire in 476 and precedes the Early Modern Era. It is the middle period of a three-period division of Western history: Classic, Medieval and Modern...

, centred on the capital of Constantinople
Constantinople
Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...

. Known simply as the Roman Empire (Greek
Greek language
Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

: , Basileia Rhōmaiōn) or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State
Roman Empire
The Roman Empire was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings in Europe and around the Mediterranean....

. It is today distinguished from ancient Rome
Ancient Rome
Ancient Rome was a thriving civilization that grew on the Italian Peninsula as early as the 8th century BC. Located along the Mediterranean Sea and centered on the city of Rome, it expanded to one of the largest empires in the ancient world....

 proper insofar as the Empire was oriented towards Greek culture, characterised by Christianity
Christianity
Christianity is a monotheistic religion based on the life and teachings of Jesus as presented in canonical gospels and other New Testament writings...

 rather than Roman paganism
Religion in ancient Rome
Religion in ancient Rome encompassed the religious beliefs and cult practices regarded by the Romans as indigenous and central to their identity as a people, as well as the various and many cults imported from other peoples brought under Roman rule. Romans thus offered cult to innumerable deities...

, and predominantly Greek-speaking
Greek language
Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

 rather than Latin-speaking.

As the distinction between Roman Empire and Byzantine Empire is largely a modern convention, it is not possible to assign a date of separation, but an important point is Emperor Constantine I's
Constantine I
Constantine the Great , also known as Constantine I or Saint Constantine, was Roman Emperor from 306 to 337. Well known for being the first Roman emperor to convert to Christianity, Constantine and co-Emperor Licinius issued the Edict of Milan in 313, which proclaimed religious tolerance of all...

 transfer in 324 of the capital from Nicomedia
Nicomedia
Nicomedia was an ancient city in what is now Turkey, founded in 712/11 BC as a Megarian colony and was originally known as Astacus . After being destroyed by Lysimachus, it was rebuilt by Nicomedes I of Bithynia in 264 BC under the name of Nicomedia, and has ever since been one of the most...

 (in Anatolia
Anatolia
Anatolia is a geographic and historical term denoting the westernmost protrusion of Asia, comprising the majority of the Republic of Turkey...

) to Byzantium
Byzantium
Byzantium was an ancient Greek city, founded by Greek colonists from Megara in 667 BC and named after their king Byzas . The name Byzantium is a Latinization of the original name Byzantion...

 on the Bosphorus
Bosporus
The Bosphorus or Bosporus , also known as the Istanbul Strait , is a strait that forms part of the boundary between Europe and Asia. It is one of the Turkish Straits, along with the Dardanelles...

, which became Constantinople, "City of Constantine" (alternatively "New Rome
New Rome
The term "New Rome" has been used in the following contexts:* "Nova Roma" is traditionally reported to be the Latin name given by emperor Constantine the Great to the new imperial capital he founded in 324 at the city on the European coast of the Bosporus strait, known as Byzantium until then and...

").
Timeline

457    Leo I becomes emperor of the Byzantine Empire.

474    Zeno crowned as co-emperor of the Byzantine Empire.

527    Justinian I becomes the sole ruler of the Byzantine Empire.

533    General Belisarius of the Byzantine Empire defeats Gelimer and the Vandals at the Battle of Ad Decimium, near Carthage, North Africa.

533    Byzantine general Belisarius makes his formal entry into Carthage, having conquered it from the Vandals.

533    Byzantine general Belisarius defeats the Vandals, commanded by King Gelimer, at the Battle of Ticameron.

535    Byzantine General Belisarius completes the conquest of Sicily, defeating the Ostrogothic garrison of Syracuse, and ending his consulship for the year.

536    Byzantine General Belisarius enters Rome while the Ostrogothic garrison peacefully leaves the city, returning the old capital to its empire.

610    Heraclius arrives by ship from Africa at Constantinople, overthrows Byzantine Emperor Phocas and becomes Emperor.

627    Battle of Nineveh: A Byzantine army under Emperor Heraclius defeats Emperor Khosrau II's Persian forces, commanded by General Rhahzadh.

 
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