The Sumerian city-state of Ur, rose to power after the death of Sargon I.
Sargon is recognized as the first ruler of the very first Empire in history. Up until his death, all sumerian city-states were part of his kingdom. After that they became independent, and sumerian culture was revived by a dynasty based at the city of Ur, who brought it to its highest peak.
Hope this is helpful!
