In Greek mythology, Athena was believed to have been born from the forehead of her father Zeus. In some versions of the story, Athena has no mother and is born from Zeus' forehead by parthenogenesis. In others, such as Hesiod's Theogony, Zeus swallows his consort Metis, who was pregnant with Athena; in this version, Athena is first born within Zeus and then escapes from his body through his forehead. In the founding myth Athena bested Poseidon in a competition over patronage of the city by creating the first olive tree. She was known as Athena Parthenos "Athena the Virgin," but in one archaic Attic myth, the god Hephaestus tried and failed to rape her, resulting in Gaia giving birth to Erichthonius, an important Athenian founding hero. Athena was the patron goddess of heroic endeavor; she was believed to have aided the heroes Heracles, Bellerophon, and Jason. Along with Aphrodite and Hera, Athena was one of the three goddesses whose feud resulted in the beginning the Trojan War.