In 1210 BC, a fleet under his command defeated the Cypriots, the first recorded naval battle in history.[1] According to some historians (Claude Schaeffer, Horst Nowacki, Wolfgang Lefèvre), this and following two victories against Cypriots were probably won by using Ugaritic ships.[2]
He is known from two inscriptions in Hieroglyphic Luwian. They record wars against former vassal Tarhuntassa, and against Alasiya in Cyprus. One inscription is found at the base of Nisantepe in the Upper City of Hattusa; the other is on the northern corner of the East Pond (Pond 1), in what is known as Chamber 2. This served as a water reservoir for Hattusa.
The chamber 2 reliefs are historically important since it records major political instability which plagued Hatti during Suppiluliuma's reign. It states that this ruler sacked the city of Tarhutassa which was a Hittite city and had briefly served as the Empire's political capital under the reign of Muwatalli II.
The Sea Peoples had already begun their push down the Mediterranean coastline, starting from the Aegean, and continuing all the way to Canaan, founding the state of Philistia—taking Cilicia and Cyprus away from the Hittites en route and cutting off their coveted trade routes. Based on records in Ugarit, the threat originated in the west, and the Hittite king asked for assistance from Ugarit.
The enemy [advances(?)] against us and there is no number [...]. Our number is pure(?) [. . .] Whatever is available, look for it and send it to me.[3]
Suppiluliuma II was probably the ruler who abandoned the capital city of Hattusa,[4] inducing the end of the Hittite empire. Some sources indicate Suppiluliuma II's end is unknown or he was simply "vanished",[2] while some claim he was killed during the sack of Hattusa in 1190 BC.[5]
After Suppiluliuma's kingdom collapsed, the Kaskians possibly took over control of Hatti. Hattusa itself was destroyed by fire, its site only re-occupied by a Phrygian fortress some 500 years later. Kuzi-Teshub, a ruler of Carchemish, would later assume the title of "Great King" since he was a direct descendant of Suppiluliuma I.[6]
^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.
^Bryce (1997), p. 363. Tudhaliya IV probably married a Babylonian princess, known by her title of Great Princess (dumu.sal gal) (Bryce 1997, pp. 294, 331).