Proto-Indo-European mythology also in the myths of the slaying of the nine-headed Lernaean Hydra by Heracles and the slaying of Python by Apollo. The story of Heracles's theft of the cattle of Geryon is probably also related. Although Heracles is not usually thought of as a storm deity in the conventional sense, he bears many attributes held by other Indo-European storm deities, including physical strength and a knack for violence and gluttony. The original Proto-Indo-European myth is also reflected in Germanic mythology. In Norse mythology, Thor, the god of thunder, slays the giant serpent Jörmungandr, which lived in the waters surrounding the
Heracles by tying them to a stick with their faces pointing downward. While walking through the wilderness, Heracles was set upon by the Dryopes. In Apollonius of Rhodes' "Argonautica" it is recalled that Heracles had mercilessly slain their king, Theiodamas, over one of the latter's bulls, and made war upon the Dryopes "because they gave no heed to justice in their lives". After the death of their king, the Dryopes gave in and offered him Prince Hylas. He took the youth on as his weapons bearer and beloved. Years later, Heracles and Hylas joined the crew of the "Argo". As Argonauts,