The eastern part of the Roman Empire after its division in the 3rd century AD. Its capital city was Constantinople (or New Rome). It represented an administrative division of the Roman Empire, but after the fall of the western part it survived until the fall of Constantinople in 1453. (source: Wikipedia)
Empire in the eastern Mediterranean which emerged from the eastern part of the Roman Empire in 395 AD and ended with the conquest of Constantinople by the Ottomans in 1453.
a continuation of the Roman Empire in the East
a continuation of the Roman Empire in the Middle East after its division in 395
