What Kings in Mesopotamia evolved from what group of people?

The kings in Mesopotamia evolved from the Sumerian city-state leaders, who were initially known as priest-kings or "ensi." As city-states grew in power and complexity, these leaders transitioned into more centralized monarchs, often claiming divine authority. Over time, various groups such as the Akkadians, Babylonians, and Assyrians also established their own dynasties, further shaping the political landscape of Mesopotamia. This evolution reflected the region's diverse cultures and shifting power dynamics throughout its history.