Passing over the Messabatae, who inhabited a valley which may perhaps be the modern MahSabadan, as well as the level district of Yamutbal or Yatbur which separated Elam from Babylonia, and the smaller districts of Characene, Cabandene, Corbiana and Gabiene mentioned by classical authors, we come to the fourth principal tribe of Susiana, the Cissii (Aesch.
In 750 B.C. Umbadara was king of Elam; Khumbanigas was his successor in 742 B.C. In 720 B.C. the latter prince met the Assyrians under Sargon at Dur-ili in Yamutbal, and though Sargon claims a victory the result was that Babylonia recovered its independence under Merodach-baladan and the Assyrian forces were driven north.
Eri-Aku was the son of Kudur-Mabug, who was prince of Yamutbal, on the eastern border of Babylonia, and also " governor of Syria."
The next two years were occupied in adding Larsa and Yamutbal to his dominion, and in forming Babylonia into a single monarchy, the head of which was Babylon.