Perun vs Tarhunna (the Storm-god of Hatti)

The thunder god of the Kievan Rus', sworn by in treaties and installed at the head of Prince Vladimir's official pantheon in 980 before Vladimir himself had his idol destroyed in 988.

Perun is the best-attested of the Rus' gods. The *Russian Primary Chronicle* has the Rus' swear by him and by their weapons in the treaties of 907 and 945, and again in 971; under 980 he stands first among the six idols Vladimir raises on the hill outside his Kiev palace, with a head of silver and a moustache of gold. Procopius, writing in the 550s, describes the early Slavs sacrificing cattle to an unnamed god who alone is "master of all" and "the maker of lightning" — not a named source for Perun, but read by most historians as the same figure centuries earlier.

The chief god of the Hittite state: a storm-god of rain and thunder who gives the land its fertility, fights the serpent Illuyanka, and, under his Hurrian name Teššub, wins kingship in heaven in the Kumarbi cycle.

Hittite scribes usually wrote the storm-god's name with a Sumerian word-sign (dU or dIŠKUR, "the Storm-god"), so the Hittite reading is partly reconstructed; Tarḫunna is the most widely accepted reading, and the Luwian form Tarḫunt survived into the first millennium BCE. The same logogram covered the Hattian storm-god Taru and, from the fifteenth century onward, the Hurrian storm-god Teššub, whom the later Hittite royal family, closely tied to Hurrian Kizzuwatna, promoted to the head of the state cult. On this site these are treated as one entry because the Hittite sources themselves write them with one sign, but readers should know that the Hattian, Hittite, and Hurrian storm-gods had separate origins and were brought together by scribes and kings.