Uranus

In Greek mythology, Uranus (Greek: Ουρανος, Ouranos, "sky" or "heaven") was the primordial deity of the sky. According to most Ancient Greek sources, Uranus was the son of Gaea without a father. After his birth, he consorted with his mother and produced the Cyclopes, the Hecatoncheires, and the Titans. Other sources write that he was the son of Aether and Gaea, Aether and Hemera, or Nyx.

In Roman mythology, Uranus was closely equated with Caelum.

Castration
Hesiod writes that Uranus would come down to the earth to lay with Gaea every night. However, from their union came the Hecatoncheires and the Cyclopes whom Uranus hated because of their appearance. Due to his hatred, Uranus imprisoned them within Tartarus, causing Gaea great pain. In order to see to the release of her sons, Gaea shaped a flint-bladed or adamantine sickle with which she had her son Cronus castrate his father when he came down to lay with Gaea.

Children
Hesiod writes in Theogony that Uranus and Gaea produced eighteen children from their union: Oceanus, Cronus, Hyperion, Coeus, Crius, Iapetus, Tethys, Rhea, Theia, Phoebe, Mnemosyne, Themis, the three Cyclopes, and the three Hecatoncheires.

After Uranus' castration, Hesiod goes on to write that some of his blood fell upon Gaea and created the Gigantes, the Meliae, and the Erinyes. When his genitals were thrown into the sea, the sea foam was created and Aphrodite was born from the foam.