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Constantine founds new capital of Roman Empire in Greek city Byzantium (Constantinople).
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Justinian's reign begins and he reconquers parts of the Western Empire.
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Hagia Sofia Completed
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Heraclius I becomes emporer with the new 'theme system.
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The great Schism. Split between Latin Roman Church and Greek Orthodox Church
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Constantinople falls to the Ottomans after invasions.
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Roman Empire divides with Western Empire based in Rome and Eastern in Constantinople.
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Muslims take North Africa and a large Muslim force begins to attack Constantinople by land and sea.
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Reconquers Syria from Muslims and Greece from Bulgars
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Roman laws codified into one document by Justinian
