I am assuming you mean who is Gilgamesh.
Gilgamesh was a King-God of the ancient city of Uruk in Sumeria. The city of Uruk is now in modern day Iraq.
In the story/poem The Epic of Gilgamesh he is described as a demigod or 2/3 god and 1/3 man.
He is also believed to be an actual historical king and not just a mythological story, although the historical records from that time are not complete.