Briareus is the name of a Hecatoncheir in Greek mythology. His brothers are Cottus and Gyges. He was the son of Ouranos and Gaia, but was found repuslive by his father due to his one hundred hands. Cronus, with the help of Gaia, overthrew Ouranos with the promise of freeing his brothers. However, he failed to fulfil this promise. Briareus and his brothers were freed by Zeus, Poseidon and Hades, for whom they made lightning bolts, a trident and a Helm of Invisbility. In some traditions, Briareus married Poseidon's daughter; Cympoleia.