At the beginning of his reign the Hittite King Suppiluliuma I reconquered Kizzuwatna, then invaded the western part of the Euphrates valley and conquered the Amurru and Nuhašše in Hanigalbat. According to the Suppiluliuma-Shattiwaza treaty, Suppiluliuma had made a treaty with Artatama, a rival of Tushratta. Nothing is known of Artatama's previous life or connection, if any, to the royal family. The document calls him king of the Hurrians, while Tushratta is given the title of King of Mitanni, which must have disagreed with Tushratta. Suppiluliuma started to plunder the lands of the west bank of the Euphrates river and he annexed Mount Lebanon. Tushratta threatened to raid beyond the Euphrates if even a single lamb or kid was stolen.