Poseidon, Greek god of the sea, was one of the most powerful of all of the gods in Greek mythology. He was one of the 12 Olympian gods and goddesses who held court on Mount Olympus - the mountain of the gods. Poseidon is the son of Cronos and Rhea, and brother to Zeus, Hades, Demeter, Hestia, and Hera. He, Zeus, and Hades divided the world into three ‘territories’; Zeus ruled over the Heavens, Hades ruled over the Underworld, and Poseidon ruled over the seas. Poseidon is often associated with bulls and horses.