The Byzantine Empire
The Byzantine Empire or the Eastern Roman Empire was the empire that followed the Roman Empire in the Middle Ages, the capital was Constantinople, and the Emperor, who ruled the Roman Emperor, ruled. The country was called the "Roman Empire" and the people of the Empire and the surrounding nations called it "Romania". Unlike the Roman Empire, the vast majority of the population actually wrote Greek. The distinction between the 'Roman Empire' and the 'Byzantium Empire' is largely a matter of modern custom, and it is not possible to capture the exact moment when the Byzantine empire broke apart, but Constantine I was bound by the Byzantium of the Bosphorus Strait in Nicomedia in Anatolia 324 AD is the watershed. The period from AD 330 to 1453 lasted 1123 years. The Byzantine empire was the most powerful monarchy in medieval Europe and was once a vigorous conquest project, almost regaining the god of the old Roman empire, unifying the vast Mediterranean world and serving as its center and even into the Middle East.