Explain how kings were chosen in early Sumerian city-states. What were the king's duties?

A corporation run by priests became the greatest landowners among the Sumerians. The priests hired the poor to work their land and claimed that land was really owned by the gods ... Presumably before the time of the Sumerians, kings were chosen by the warriors, with the king as the leading warrior. Among their duties were leading the military, administering trade, judging disputes, and engaging in the most important religious ceremonies. A bureaucracy assisted the king. Consisting of priests, it bore all the responsibility of surveying and distributing land as well as distributing crops.