We are fortunate in that both the Gilgamesh Epic and Sumerian King List mention Gilgamesh in correct name and also in correct time (i.e., postdiluvian or postflood). They also both name his father ...
They were written thousands of years ago on clay tablets. This Sumerian King List prism is from around 2004BC-1595BC. The Sumerian King List is a group of clay prisms with names of Sumerian cities ...