empire ( 395-1453) in SE Europe & SW Asia, formed by the division of the Roman Empire: cap. Constantinople
See Byzantine Empire in American Heritage Dictionary 4
also Eastern Empire
The eastern part of the later Roman Empire, dating from A.D. 330 when Constantine I rebuilt Byzantium and made it his capital. Its extent varied greatly over the centuries, but its core remained the Balkan Peninsula and Asia Minor. The empire collapsed when Constantinople fell to the Ottoman Turks in 1453.