 A usurper, Ur-Ninurta seized the throne on the fall of Lipit-Ištar and held it until his violent death some 28 years later.He called himself “son of Iškur,” the southern storm-god synonymous with Adad, in his "adab to Iškur".His name was wholly Sumerian, in marked contrast to the Amorite names of his five predecessors.