By the 3rd millennium BCE, southern Mesopotamia was organized into 20-30 city-states, consisting of urban centers, towns, villages, and hamlets. Each city-state had its principle guardian deity. Ur’s patron was Nanna, the moon god. Officially, the city-state was the deity’s property. These deities chose and nurtured the city-state’s ruler, whose title varied from place to place. Lugal, literally, “big man,” was one title. For their part, city-state rulers acted on the deity’s behalf, even on the battlefield. Though sources provide evidence of peaceful cooperation among city-states, they equally record conflicts, both local disputes and more wide-ranging conquests. A long simmering dispute over the border between Lagash and Umma and involving access to water is the best documented interstate conflict. The Standard of Ur and other royal monuments provide graphic illustrations of these battles and their aftermaths.
In addition to being a warrior, the city-state’s ruler was an intermediary between the gods and the people. One of his major responsibilities was to build and maintain the temples of the city’s gods and goddesses, a responsibility that included provisioning their cults. In doing so he guaranteed the fertility of the land, which the Standard’s Peace side so vividly illustrates.