Suppiluliuma I
The unrest weakened the Mitannian control of their vassal states, and Aziru of Amurru seized the opportunity and made a secret deal with the Hittite king Suppiluliuma I. Kizzuwatna, which had seceded from the Hittites, was reconquered by Suppiluliuma. In what has been called his first Syrian campaign, Suppiluliuma then invaded the western Euphrates valley, and conquered the "Amurru" and "Nuhasse" in Mitanni.