L. W. King, A History of Sumer and Akkad
“ Each city was ruled by a separate king, whose overthrow is recorded on the vases, but, since they were defeated in the same battle, we may conjecture that they formed the centre of a single confederation or dominion, of which Kish was the head. In two of the texts the king of Kish is referred to, not only by his title, but by name, and, since he bore the Semitic name of Enbi-Ishtar, we may conclude that at this period Kish, and probably Opis and other northern cities, were already under Semitic domination. ”
