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After Shattiwazza had been made a vassal ruler of Hanilgabat, Piyashshili was given the territory of Ashtata (with the cities of Ekalte, Ahuna and Terqa) and Carchemish, formerly belonging to Hanigalbat, by his father. "And all of the cities of the land of Carchemish, Murmurik, Shipri, Mazuwati and _urun – these fortified cities– I gave to my son." (Suppililiumas-Shattiwazza treaty). In fact, the whole former territory of Hanilgabat west of the Euphrates seems to have come under direct Hittite rule and was governed by Piyashshili.
When the Egyptians attacked Kadesh (Kinza), the town was besieged and taken by Suppililiumas. The people were deported and Piyashshili made governor. Piyashshili fell ill and died before year 9 of Mursili II. After his death, a rebellion broke out in Quadesh and Nuhashshe . After it had been quelled, Piyashshili's son was made king of Quadesh by his uncle Mursili II.