Tarḫunna or Tarḫuna/i was the Hittiteweather god. He was also referred to as the "Weather god of Heaven" or the "Lord of the Land of Hatti".
Name
Tarḫunna is a cognate of the Hittite verb tarḫu-zi, "to prevail, conquer, be powerful, be able, defeat"; from the Proto-Anatolian weather god *Tṛḫu-ent-, "conquering"; ultimately from PIE*terh₂-, "to cross over, pass through, overcome". The same name was used in almost all Anatolian languages: LuwianTarḫunz-; CarianTrquδ-; MilyanTrqqñt-, and Lycian: Trqqas, Trqqiz. Norbert Oettinger has argued that the Anatolian weather god comes from the Proto-Indo-European god Perkwunos, but that they did not preserve the old name to coin instead the new epithet Tṛḫu-ent-, which sounded close to the name of the Hattian Storm-god Taru.
Role
As weather god, Tarḫunna was responsible for the various manifestations of the weather, especially thunder, lightning, rain, clouds, and storms. He ruled over the heavens and the mountains. Thus it was Tarḫunna who decided whether there would be fertile fields and good harvests, or drought and famine and he was treated by the Hittites as the ruler of the gods. Tarḫunna legitimised the position of the Hittite king, who ruled the land of Hatti in the name of the gods. He watched over the kingdom and the other institutions of the state, but also borders and roads.
Tarḫunna was the chief god of the Hittites and is depicted at the front of a long line of male gods in rock reliefs at the sanctuary of Yazılıkaya. There he is depicted as a bearded man with a pointed cap and a sceptre, standing on the backs of the mountain gods and holding a three-pronged thunderbolt in his hand. Later depictions show him with a battle axe in the form of an adze.
Equivalents
The god had cognates in most other ancient Anatolian languages. In Hattian, he was called Taru; in Luwian, Tarḫunz nt; in Palaic, Zaparwa; in Lycian, Trqqas/Trqqiz; and in Carian, Trquδe. In the wider Mesopotamian sphere, he was associated with Hadad and Teššup. The Luwian god Tarḫunz worshipped by the Iron AgeNeo-Hittite states was closely related to Tarḫunna, Personal names referring to Tarḫunz, like "Trokondas", are attested into Roman times.