By 2375 bc, most of Sumer was united under one king, Lugalzaggisi of Umma.
Warfare between cities eventually led to the rise of kings, called lugal s, whose authority replaced that of city-state rulers. Sumer became a more unified state, with a common culture and a centralized government. This led to the establishment of a bureaucracy and an army. By 2375 bc, most of Sumer was united under one king, Lugalzaggisi of Umma.