Mutakkil-Nusku, inscribed mmu-ta/tak-kil-dPA.KU (meaning "he whom Nusku endows with confidence") was king of Assyria briefly c. 1132 BC, during a period of political decline.
He drove him to Karduniaš (Babylonia).” Contemporary evidence suggests that Ninurta-tukultī-Aššur sought sanctuary in the border town of Sišil, where Mutakkil-Nusku’s forces engaged him in battle, the outcome of which is lost.
[2] He was a younger son of the long-reigning king, Aššur-dān I (c. 1179 to 1134 BC) and succeeded his brother Ninurta-tukultī-Aššur, whom he ousted in a coup and subsequently went on to fight in a civil war that seems to have pitched the Assyrian heartland against its provinces.
The fragments of one or perhaps two Middle Assyrian letters exist,[i 2] from an unnamed Babylonian king, possibly Ninurta-nādin-šumi, to Mutakkil-Nusku, where he is told that "You should act according to your heart (ki libbika).” The text lambastes him for failing to keep an appointment, or a challenge, in Zaqqa and seems to confirm that Ninurta-tukultī-Aššur had reached exile in Babylonia.
[5] Apart from a brief economic text concerning 100 sheep of Mutakkil-Nusku, without a royal title, and his appearance in the genealogies of his descendants such as one of his sons, Aššur-rēša-iši I,[3] there are no other extant inscriptions.