Crius was one of the elder Titans, sons of Ouranos and Gaia. Led by Kronos, the brothers conspired against their father and prepared an ambush for him as he descended to lie with Earth. Krios, Koios, Hyperion and Iapetos were posted at the four corners of the world where they seized hold of the Sky-god and held him firm, while Kronos, hidden in the centre, castrated him with a sickle.