Information about Sumerian history is found on the Sumerian King List as well as Sumerian clay tablets and cylinder seals. In the Sumerian King Lists are mentioned all the rulers of Earth 400,000 years back. This huge period of time of thousands of years has caused most historians to reject its accuracy. However all the early rulers were allegedly gods -- demi-gods or immortals.
The Anunnaki (Sumerian: "those who came down from the heavens";