In the West, he influenced the many kingdoms of Amurru which controlled the central Levantine coast between Byblos and Ugarit acknowledged his authority.
[note 2][9] Since early in their history, Qatna and Yamhad shared a hostile relation;[12] the situation worsened during Išḫi-Addu's reign and evolved into border warfare.
[14] The sources of Mari are silent on how the king dealt with the situation that resulted from Shamshi-Adad's peace with Yamhad, and by the time they resumed mentioning Qatna in c. 1772 BC, Išḫi-Addu was dead and succeeded by his son Amut-piʾel II.
[18] The king of Assyria asked for two horses from Qatna, and it seems that Išḫi-Addu asked for something in return, but Ishme-Dagan sent a small amount of the horses' real value and seems to not have met Išḫi-Addu's request causing the latter to write an angry message,[note 3][18] which was apparently intercepted in Mari by Yasmah-Adad who had interest in keeping his brother and father in law at peace.
[21] His letters concerning his daughter also reveal a man capable of compassion; he wrote Yasmah-Adad: "I am placing in your lap my flesh and my future.