These people called themselves the gag-gigga, meaning "black-headed people."  During the rule of Ennantum of Lagash, who unified many city-states and even extended the realm to Elam.  The last king of
These people called themselves the gag-gigga, meaning "black-headed people."  During the rule of Ennantum of Lagash, who unified many city-states and even extended the realm to Elam.  The last king of the Lagash dynasty, Lugal-Zage-Si was the last king of the ethnicity, conquering (*) Uruk, where he established his capital.  Following his rule, the lands came under the domination of Semitics from Akkad, during which their native language phased out of common ussage.  FTP – What civilization is credited with the invention of the wheel, and the establishment of the first writing system, which is called cuneiform. 
These people called themselves the gag-gigga, meaning "black-headed people."  
{Sumerians} 