During the Bronze Age collapse (1200–900 BC), Babylonia was in a state of chaos, dominated for long periods by Assyria and Elam. The Kassites were driven from power by Assyria and Elam, allowing native south Mesopotamian kings to rule Babylonia for the first time, although often subject to Assyrian or Elamite rulers. However, these East Semitic Akkadian kings, were unable to prevent new waves of West Semitic migrants entering southern Iraq, and during the 11th century BC Arameans and Suteans entered Babylonia from The Levant, and these were followed in the late 10th to early 9th century BC by the migrant Chaldeans who were closely related to the earlier Arameans.