Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
King of Shinar, southern Chaldea, one of the confederates of Chedorlaomer, king of Elam, in a war against Sodom and cities of the plain (Gen. 14:1, 4). It is now found that Amraphel (or Ammirapaltu) is the Khammu-rabi whose name appears on recently-discovered monuments.
After defeating Arioch (q.v.) he united Babylonia under one rule, and made Babylon his capital.