Sargon of Akkad, also known as Sargon the Great "the Great King" (Akkadian Šarru-kīnu, meaning "the true king" or "the king is legitimate"), was a Semitic Akkadian emperor famous for his conquest of the Sumerian city-states in the 23rd and 22nd centuries BC. The founder of the Dynasty of Akkad, Sargon reigned during the last quarter of the third millennium BC. He became a prominent member of the royal court of Kish, killing the king and usurping his throne before embarking on the quest to conquer Mesopotamia.

http://en.wikipedia.org/wiki/Sargon_of_Akkad