In Greek mythology, Gaia (/ˈɡeɪ.ə/ or /ˈɡaɪ.ə/ from Ancient Greek Γαῖα, a poetical form of Γῆ Gē, "land" or "earth") also spelled Gaea, was the personification of the Earth and one of the Greek primordial deities. Gaia was the great mother of all: the primal Greek Mother Goddess; creator and giver of birth to the Earth and all the Universe; the heavenly gods, the Titans, and the Giants were born to her. The gods reigning over their classical pantheon were born from her union with Uranus (the sky), while the sea-gods were born from her union with Pontus (the sea). Her equivalent in the Roman pantheon was Terra.