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The Byzantine Empire or Eastern Roman Empire was the Roman Empire during the Middle Ages, centered on the capital of Constantinople, and ruled by emperors in direct succession to the ancient Roman emperors. It was called the Roman Empire, and also Romania (Greek: Ῥωμανία, Rhōmanía), by its inhabitants and its neighbours. As the distinction between "Roman Empire" and "Byzantine Empire" is purely a modern convention, it is not possible to assign a date of separation, but an important point is the Emperor Constantine I's transfer in 324 AD of the capital from Nicomedia (in Anatolia) to Byzantium on the Bosphorus, which became Constantinople (alternatively "New Rome").

Constantine moved the seat of the Empire, and introduced important changes into its civil and religious constitution. In 330 AD, he founded Constantinople as a second Rome on the site of Byzantium, which was well-positioned astride the trade routes between East and West. He stabilized the coinage (the gold solidus that he introduced became a highly prized and stable currency), and made changes to the structure of the army. Under Constantine, the Empire had recovered much of its military strength and enjoyed a period of stability and prosperity.

Under Constantine, Christianity did not become the exclusive religion of the state, but enjoyed imperial preference, since the Emperor supported it with generous privileges. Constantine established the principle that emperors should not settle questions of doctrine, but should summon general ecclesiastical councils for that purpose. The Synod of Arles was convened by Constantine, and the First Council of Nicaea showcased his claim to be head of the Church.

The state of the Empire in 395 may be described in terms of the outcome of Constantine's work. The dynastic principle was established so firmly that the emperor who died in that year, Theodosius I, could bequeath the imperial office jointly to his sons: Arcadius in the East and Honorius in the West. Theodosius was the last emperor to rule over the full extent of the empire in both its halves.

The Eastern Empire was largely spared the difficulties faced by the West in the third and fourth centuries, due in part to a more established urban culture and greater financial resources, which allowed it to placate invaders with tribute and pay foreign mercenaries. Theodosius II further fortified the walls of Constantinople, leaving the city impervious to most attacks; the walls were not breached until 1204.

After the fall of Attila, the Eastern Empire enjoyed a period of peace, while the Western Empire collapsed to the pressure of the Ostrogroths. To recover Italy, the emperor Zeno could only negotiate with the Ostrogoths of Theodoric, who had settled in Moesia. He sent the gothic king to Italy as magister militum per Italiam ("commander in chief for Italy"). After the fall of Odoacer in 493, Theodoric, who had lived in Constantinople during his youth, ruled Italy on his own.

Justinian I, who assumed the throne in 527, oversaw a period of recovery of former territories. In 532, attempting to secure his eastern frontier, Justinian signed a peace treaty with Khosrau I of Persia agreeing to pay a large annual tribute to the Sassanids. The western conquests began in 533, as Justinian sent his general Belisarius to reclaim the former province of North Africa from the Vandals with an army of about 15,000 men. Success came with surprising ease, but it was not until 548 that the major local independent tribes were subdued. In Ostrogothic Italy, the deaths of Theodoric the Great, his nephew and heir Athalaric, and his daughter Amalasuntha had left her murderer Theodahad on the throne despite his weakened authority. In 535, a small Byzantine expedition sent to Sicily met with easy success, but the Goths soon stiffened their resistance, and victory did not come until 540, when Belisarius captured Ravenna, after successful sieges of Naples and Rome.

After Justinian died in 565, his successor, Justin II refused to pay the large tribute to the Persians, thus sparking tensions. Meanwhile, the Germanic Lombards invaded Italy; by the end of the century only a third of Italy was in Byzantine hands. In the early 7th century, the Roman-Persian War started. The Sassanid Persia conquered Mesopotamia, Syria, and much of Anatolia, further reducing the size of the Byzantine Empire. The wars weakened both Byzantium and Persia, which allowed the Arabs to expand at the cost of the other empires.

In the early Middle Ages the Byzantine Empire managed to regain some of its power in Anatolia, but never regained its former strength. Under Basil II the Empire stretched from modern-day Croatia to modern-day Armenia. After nearly 100 years of war against the Ottoman, Byzantium fell in 1453 and the Byzantine Empire ended.

Based on Wikipedia content that has been reviewed, edited, and republished under the Creative Commons Attribution Share-Alike 3.0 license. Last reviewed by Jan van der Crabben. Please help and improve this definition!

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