In Greek mythology, Gaia is the personification of Earth. Gaia is the ancestral mother sometimes parthenogenic of all life. She is the mother of Uranus (Sky), from whose sexual union she bore the Titans (themselves parents of many of the Olympian gods), the Cyclopes, and the Giants; as well as of Pontus (Sea), from whose union she bore the primordial sea gods. Her equivalent in the Roman pantheon was Terra.