It is only for the later parts of the ED period that information on political events becomes available, either as echoes in later writings or from contemporary sources. Writings from the end of the third millennium, including several Sumerian heroic narratives and the Sumerian King List, seem to echo events and military conflicts that may have occurred during the ED II period. For example, the reigns of legendary figures like king Gilgamesh of Uruk and his adversaries Enmebaragesi and Aga of Kish possibly date to ED II. These semi-legendary narratives seem to indicate an age dominated by two major powers: Uruk in Sumer and Kish in the Semitic country. However, the existence of the kings of this "heroic age" remains controversial.