Suppiluliuma I (Shuppiluliuma), king of the Hittites from around 1358 BCE, had begun his career as advisor and general to Tudhaliya III, then based at Samuha.
In this capacity he had defeated the Hittites' enemies among the Hayasa and the Kaskas.
Both enemies then united around charismatic leaders to counter him; of these Karanni founded a semblance of a royal court in Hayasa, and Piyapili failed to do likewise for the Kaska.
Suppiluliuma and Tudhaliya defeated these threats in turn, to the extent that the Hittite court could settle in Hattusa again.
At some point, Suppiluliuma deposed and probably murdered his liege.
Some of the priests would later report this to Suppiluliumas's son, successor, and biographer Mursili II, holding it as an outstanding crime of the whole dynasty.