He freed a small area of land previously ruled by the fellow Amorite city state of Kazallu which included Babylon, then a minor administrative center in southern Mesopotamia.
[1][2] An alternative view is that the Sūmû-abum controlling Kisurra was actually a ruler in the 6th Dynasty of Uruk, preceding Sîn-kāšid.
It was then briefly lost to Larsa but recovered by Sūmû-abum in his 13th reigning year.
While Kish was no longer a powerful city, it maintained its outsized symbolic importance.
[6] He should not be confused with Isi-sümü-abum of the same period who ruled a city as yet unknown.