About 2350 B.C., a conqueror named Sargon defeated the city-states of Sumer. Sargon led his army from Akkad a city-state north of Sumer. The Akkadians had long before adopted most aspects of Sumerian culture. Sargon’s conquests helped to spread that culture even farther, beyond the Tigris-Euphrates Valley. By taking control of both northern and southern Mesopotamia.