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Emperor Constantine reinaugiated the capital city of Rome to the capital city of Byzantine.
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It was the most violent riot ever in Constantinople. The city was burned and destroyed, thousands of people were killed.
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Belisarius held military campaigns against the Vandals and the Ostrogoths He was rewarded with a land and sea exhibition against the Vandals kingdom.
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Hagia Sophia used to be a Christian patriarchal basilica. It later became an imperial mosque. Today it is a museum in Istanbul, Turkey.
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In the 630s, tons of Arabs came from The Arab Penninusla, so Byzantium's southern province decreased because of the Muslims. In the next 50 years the Muslims and Byzantine fought. Byzantine's capital was threatened twice.
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The East-West Schism, between the Eastern and Western church.
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Emperor Alexis I asked Popr Urban II if the western volunteers could come and help him keep out the invading Seljuq Turks from Anatolia.
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A Western European armed exposition intended to conquer Jerusalem. Then most of the crusade made an agreement with the Byzantine prince to go and conquer Constantinople instead.
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An Ottoman army entered Constantinople and entered the Hagia Sophia. Emperor Constantine XI was killed in the battle.
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There were conflicts between the Bulgarian Empire and Byzantine Empire. The Byzantines conquered Bulgaria and gained control over the whole Balkan Peninsula.