few decades. However, East Semitic-speaking Babylonia soon began to suffer further repeated incursions from West Semitic nomadic peoples migrating from the Levant during the Bronze Age collapse, and during the 11th century BC large swathes of the Babylonian countryside was appropriated and occupied by these newly arrived Arameans and Suteans. Arameans settled much of the countryside in eastern and central Babylonia and the Suteans in the western deserts, with the weak Babylonian kings being unable to stem these migrations. Period of chaos, 1026–911 BC The ruling Babylonian dynasty of Nabu-shum-libur was deposed by marauding Arameans in 1026 BC, and the heart of Babylonia, including the capital city itself descended into anarchic state, and no king was to rule Babylon for over 20 years. However, in southern Mesopotamia (a region corresponding with the old Dynasty of the Sealand), Dynasty V (1025–1004 BC) arose, this was ruled by Simbar-shipak, leader of a Kassite clan, and was in effect a separate state from Babylon. The state of anarchy allowed the Assyrian ruler Ashur-nirari IV (1019–1013 BC) the opportunity to attack Babylonia in 1018 BC, and he invaded and captured the Babylonian city of Atlila and some northern regions for Assyria. The south Mesopotamian dynasty was replaced by another Kassite Dynasty (Dynasty VI; 1003–984 BC) which also seems to have regained control over Babylon itself. The Elamites deposed this brief Kassite revival, with king Mar-biti-apla-usur founding Dynasty VII (984–977 BC). However, this dynasty too fell, when the Arameans once more ravaged Babylon. Babylonian rule was restored by Nabû-mukin-apli in 977 BC, ushering in Dynasty VIII. Dynasty IX begins with Ninurta-kudurri-usur II, who ruled from 941 BC. Babylonia remained weak during this period, with whole areas of Babylonia now under firm Aramean and Sutean control. Babylonian rulers were often forced to bow to pressure from Assyria and Elam, both of which had appropriated Babylonian territory. Assyrian rule, 911–619 BC Babylonia remained in a state of chaos as the 10th century BC drew to a close. A further migration of nomads from the Levant occurred in the early 9th century BC with the arrival of the Chaldeans, another nomadic northwest Semitic people described in Assyrian annals as the "Kaldu". The Chaldeans settled in the far southeast of Babylonia, joining the already long extant Arameans and Suteans. By 850 BC the migrant Chaldeans had established their own land in the extreme southeast of Mesopotamia. From 911 BC