Hammurabi was the most powerful king in southern Mesopotamia. But up to the north, another king was building another empire His name was Shamshi-Adad, and he didn’t want to be a fair ruler who made good laws. He just wanted to rule the whole world. Shamshi-Adad lived in a city called Assur. Babylon was in the south of Mesopotamia, next to the Euphrates River. But Assur was in the north part of Mesopotamia, beside the Tigris River.