Isar-Damu fought a long war with Mari which ended in Eblaite victory; he was probably the last king of the first kingdom.
Isar-Damu succeeded his father Irkab-Damu as a young child; his mother, Dusigu, seems to have taken advantage of her position as her husbands favorite wife and her probable familial relation to the powerful vizier Ibrium in order to elevate her son to the throne, despite him being one of Irkab-Damu's youngest sons.
[12] Isar-Damu concluded an alliance with Nagar and Kish against Mari,[13] and the campaign was headed by the Eblaite vizier Ibbi-Sipish, Ibrium's son, who led the combined armies to victory in a battle near Terqa.
[15] Isar-Damu ruled 35 years,[16] and his main wife was Tabur-Damu but his crown prince Ir'ak-Damu was his son by an earlier consort whose name is unknown.
[11] Although Isar-Damu is generally considered Ebla's first kingdom last monarch, his son Ir'ak-Damu, who was married to Za'ase, Ibbi-Sipish's daughter,[4] might have succeeded him for a short period.