 However, after having reigned for only six years, Erishum II was to be the last king of the dynasty of Puzur-Ashur I (founded c. 2025 BC) as he was deposed and the throne of Assyria was usurped by Shamshi-Adad I during the expansion of the Amorite tribes from the Khabur River delta in the north-eastern Levant.Although regarded as an Amorite by later Assyrian tradition, Shamshi-Adad I's descent is suggested to be from the same line as the native Assyrian ruler Ushpia within the Assyrian King List.Shamshi-Adad I had inherited the throne in Terqa from his father Ila-kabkabu.