In Greek mythology, Uranus (Ouranos) is the personification of the sky and the son and mate of Gaia. Their children are the Hecatonchires (Centimani), the Cyclopes and the Titans. Uranus was jealous of the future power of his children and feared he would lose his rulership to them. He threw his children in the underworld to prevent this. At the instigation of Gaia, her son Cronus castrated his father and dethroned him. When Uranus' blood fell upon the Earth (Gaia), the Erinyes (the goddesses of vengeance) and the Gigantes (giants) sprang forth, among many other divinities.