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 "εν γόνασιν"), meaning "on his knees" or "the Kneeler", to the constellation known as Heracles' constellation. The story, among others, is described by Dionysius of Halicarnassus. Before Homer's Trojan War, Heracles had made an expedition to Troy and sacked it. Previously, Poseidon had sent a sea monster to attack Troy. The story is related in several digressions in the "Iliad" (7.451–453, 20.145–148, 21.442–457) and is found in pseudo-Apollodorus' Bibliotheke (2.5.9). This expedition became the theme of the Eastern pediment of the Temple of Aphaea. Laomedon planned on sacrificing his daughter Hesione to Poseidon in the hope of appeasing him. Heracles