Gaia ("land" or "earth") is the Earth in Greek mythology (her Roman equivalent was Tellus or Terra), a primeval goddess. She was the daughter of Chaos, and the mother of Uranus (also her husband), Ourea and Pontus. Uranus and Pontus were born with no father, of Gaia alone.
With Uranus, Gaia had three sets of children: one-hundred armed giants called Hecatonchires and one-eyed giants called Cyclopes were the youngest, and significantly later, the Titans. Occasionally, the Erinyes were considered a fourth set of children by Gaia and Uranus.
Uranus hid the (Hecatonchires) and the the Cyclopes in Tartarus so that they would not see the light, rejoicing in this evil doing. This caused pain to Gaia (Tartarus was her bowels) so she created grey flint (or adamantine) and shaped a great sickle and gathered together Cronus and his brothers to ask them to obey her. Only Cronus was willing to do the deed, so Gaia gave him the sickle and set him in ambush. Cronus jumped out and lopped off his father's testicles, casting them behind him. From his blood on the Earth came forth the Gigantes, Erinyes and Meliae. From the testicles of Uranus in the sea came forth Aphrodite. For this, Uranus called his sons Titans, meaning "strainers" for they strained and did presumptuously a fearful deed, for which vengeance would come afterwards.
After Uranus' castration, Gaia gave birth to Echidna and (sometimes) Typhon by Tartarus. By Pontus, Gaia birthed Nereus, Thaumas, Phorcys, Ceto and Eurybia.
As Uranus had been deposed by his son, Cronus, so was Cronus destined to be overthrown by his son. To prevent this, he swallowed his children as soon as they were born. Gaia gave Cronus' wife, Rhea the idea to save the last child, Zeus, by giving Cronus a stone wrapped up like a baby. Gaia then raised Zeus (according to some versions of the story), who eventually rescued his brothers and sisters, eaten by Cronus, as well as releasing the Cyclopes, Hecatonchires and Gigantes from Tartarus. Together, Zeus and his allies overthrew Cronus.
When Apollo killed Gaia's child, Python, she punished him by sending him to King Admetus as a shepherd for nine years.
Zeus hid one lover, Elara, from Hera by hiding her under the earth. His son by Elara, the giant Tityas, is therefore sometimes said to be a son of Gaia, the earth goddess, and Elara.
Gaia made Aristaeus immortal.
Gaia was the original deity behind the Oracle at Delphi. She passed her powers on to, depending on the source: Poseidon, Apollo or Themis.
Consorts/Children
See also the Gaia hypothesis.