Shattiwaza was the son of king Tushratta. His Hurrian name was Kili-Tešup.
In the political turmoil following the death of his predecessor, the usurper Shuttarna III tried to murder Shattiwaza. Shattiwaza escaped and sought refuge by the Hittite king Suppiluliuma I. He married the daughter of Suppiluliuma and returned to Mitanni with a Hittite army. He was assisted by Piyassili (Sarri-Kusuh), a son of King Šuppiluliuma I.
Shuttarna III, who had usurped the throne in his absence was defeated, and Shattiwaza installed as king of Mitanni. The events are recorded in two treaties of Suppiluliuma and Shattiwaza (sometime between 1350 and 1300 BC).
But Piyassili and the Hittites may have received the whole former territory of Hanigalbat/Mitanni west of the Euphrates as the result of these events.
- Mladjov, I., (2019). "The Kings of Mittani in Light of the New Evidence from Terqa", in: NABU 2019, No. 1, March, p. 34.
- Pruzsinszky, Regine. "Emar and the Transition from Hurrian to Hittite Power". Representations of Political Power: Case Histories from Times of Change and Dissolving Order in the Ancient Near East, edited by Marlies Heinz and Marian H. Feldman, University Park, USA: Penn State University Press, 2021, pp. 21-38
- Devecchi, Elena, (2018). “Details That Make the Difference: The Akkadian Manuscripts of the ‘Šattiwaza Treaties.’”, in: Die Welt Des Orients, vol. 48, no. 1, 2018, pp. 72–95. See p. 72: "...The so-called 'Šattiwaza treaties' are a set of two documents (CTH 51 and CTH 52) ratifying the subjugation of Šattiwaza of Mittani to the Hittite king Šuppiluliuma I, an event dated to the 2nd half of the 14th century BCE..."
- Beckman, Gary (1996). Harry A. Hoffner (ed.). Hittite Diplomatic Texts. Scholars Press. ISBN 978-0788505515.
- "Suppiluliuma (Hittite) – Shattiwaza (Mitanni) Treaty Excerpts". Zoroastrial Heritage. K. E. Eduljee. Retrieved 17 November 2015.