Myths
The myths says that Gaia was born, or arose from The Chaos and she brought forth Uranus (Sky) to cover her, Ourea (Hills) and Pontus (Deep of the Sea), but there are another versions that says that Gaia gave birth to Uranus, Ourea and Pontus through parthenogenesis (without the need of a partner). Gaia and Uranus then procreated a lot of children, like the Cyclops, the Hecatonchires and the Titans.
Another myth says that one day Uranus hid the Hecatonchires and Titans in Tartarus (lowest part of Earth, below Hares and the Titan brother of the Goddess Gaia), she was hurt and created a flint sickle made of adamantite and gather all of her brothers and told them to obey her. After this, Gaia asked Cronus to help her with her revenge against Uranus, she told Cronus to take the flint sickle and damage Uranus.
Another myth says that one day Uranus hid the Hecatonchires and Titans in Tartarus (lowest part of Earth, below Hares and the Titan brother of the Goddess Gaia), she was hurt and created a flint sickle made of adamantite and gather all of her brothers and told them to obey her. After this, Gaia asked Cronus to help her with her revenge against Uranus, she told Cronus to take the flint sickle and damage Uranus.