History
Like the Egyptians, the Sumerians recorded a long pre-dynastic history. The Sumerians recorded a series of king lists for different cities, which they claimed ruled Mesopotamia in sequence, with the kingship being taken from city to city. Modern Assyriologists generally disregard the idea that the kingship passed from city to city in a long line of dynasties, as this would push the foundation of Sumer back to approximately 23,645 BC, after the Flood of Ziusudra. Adding the dynasties listed before the flood, human history would have begun approximately 264,845 BC. This is a tremendous period of time and is generally disregarded by both Assyriologists and historians as being nothing more than myths. However, humans were around at the time, and the brief records of the time-periods in question do correlate with significant events in human prehistory as determined by research into geology, paleoclimatology, and archaeogenetics.