His existence is disputed. In the treaty between Muwatalli II and Talmi-Šarruma of Aleppo, reference is made to a ruler named Hattusili, but it is debated whether the reference is to an otherwise unknown Hittite ruler, or rather to Hattusili I.
^King (lugal) of Tarhuntassa (Bryce 1997, p. 296); apparently later Great King of Hatti (Bryce 1997, p. 354).
^Nerikkaili married a daughter of Bentesina, king of Amurru (Bryce 1997, p. 294).
^Two daughters of Hattusili III were married to the pharaoh Ramesses II; one was given the Egyptian name Ma(hor)nefrure. Another, Gassuwaliya, married into the royal house of Amurru. Kilushepa was married to a king of Isuwa. A daughter married into the royal family of Babylon. A sister of Tudhaliya IV married Sausgamuwa, king of Amurru after his father Bentesina. From Bryce (1997), pp. 294 and 312.
^For example, Astour, Michael, "Hittite History and Absolute Chronology of the Bronze Age" (1989) rejects his existence; Guterbock, H.G., JNES 29 (1970) accepts his existence, and Bryce, "Kingdom of the Hittites" (1998) remains undecided.