Thus Hammurabi ascended to the throne as the king of a minor kingdom in the midst of a complex geopolitical situation. The powerful kingdom of Eshnunna controlled the upper Tigris River while Larsa controlled the river delta. To the east of Mesopotamia lay the powerful kingdom of Elam, which regularly invaded and forced tribute upon the small states of southern Mesopotamia. In northern Mesopotamia, the Assyrian king Shamshi-Adad I, who had already inherited centuries old Assyrian colonies in Asia Minor, had expanded his territory into the Levant and central Mesopotamia, although his untimely death would somewhat fragment his empire.