The Byzantine Empire

The Byzantine Empire considered itself the only true inheritor both of the Roman Empire and of the Christian religion. This fact made the Empire something somewhere between an ally and an enemy to the West. Whether the two were cooperating or fighting, though, events in Byzantium were of great importance to Outremer (especially to Antioch) and to the Crusading movement.
Constantinople was the capital and the greatest city in Christendom in terms of wealth, population, and political power. The Empire it ruled consisted of Asia Minor, the Balkans, and Greece. Over the 12th and 13th centuries…