They finally fell 1453 to the Turks
Answer:
The Byzantine Empire, also referred to as the Eastern Roman Empire, or Byzantium, was the continuation of the Roman Empire in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinople. It survived the fragmentation and fall of the Western Roman Empire in the 5th century AD and continued to exist for an additional thousand years until it fell to the Ottoman Empirein 1453.
Through the ruler/king/city-state leader. The Sumerian ruler had to show how he was divinely chosen for his ruling, so he oftentimes named himself the father of the country and had himself portrayed as the middle guy or messenger between the gods - they were polytheistic with Zeus, Hera, Poseidon, and others - and the people.