In Hittite mythology, Illuyanka was a serpentine dragon slain by Tar?unz (dIM), the Hittite incarnation of the Hurrian god of sky and storm. It is known from Hittite cuneiform tablets found at Çorum-Bo?azköy, the former Hittite capital Hattusa. The contest is a ritual of the Hattian spring festival of Puruli.
The myth is found in Catalogue des Textes Hittites 321, which gives two consecutive versions.
Illuyanka is probably a compound, consisting of two words for "snake", Proto-Indo-European *h?illu- and *h?eng(w)eh?-. The same compound members, inverted, appear in Latin anguilla "eel". The *h?illu- word is cognate to English eel, the anka- word to Sanskrit ahi.
In the first version, the Storm God and Illuyanka fight, and the serpent wins. The Storm God then goes to the Hattian goddess Inaras for advice. Having promised to sleep with a mortal named Hupasiyas in return for his help, she devises a trap for the dragon. She goes to him with large quantities of food and drink and entices him to drink his fill. Once drunk, the dragon is bound by Hupasiyas with a rope. Then the Storm God appears with the other gods and kills the dragon.
In the second version, after the two gods fight and the Storm God loses, Illuyanka takes the Storm God's eyes and heart. To avenge himself upon the dragon, the Storm God marries the daughter of a poor man. They have a son, who grows up and marries the daughter of the dragon Illuyanka. The Storm God tells his son to ask for the return of the Storm God's eyes and heart as a wedding gift and he does so. His eyes and heart restored, the Storm God goes to face the dragon Illuyanka once more. At the point of vanquishing the dragon, the Storm God's son finds out about the battle and realizes that he had been used for this purpose. He demands that his father take his life along with Illuyanka's and so Teshub kills them both. A version of this narrative is illustrated on a relief which was discovered at Malatya (dating from 1050-850 BC) and is on display in the Museum of Anatolian Civilizations in Ankara, Turkey.
The Hittite texts were introduced in 1930 by W. Porzig, who first made the comparison of Teshub's battle with Illuyankas with the sky god Zeus' battle with serpent-like Typhon, told in Pseudo-Apollodorus, Bibliotheke (I.6.3); the Hittite-Greek parallels found few adherents at the time, the Hittite myth of the castration of the god of heaven by Kumarbi, with its clearer parallels to Greek myth, not having yet been deciphered and edited.
Catalogue des Textes Hittites 321 consists of the following tablets:
None of the individual versions is complete. Text A is the most complete, including 30 out of 36 paragraphs.