God of the sea, rivers, floods, droughts, earthquakes, and the creator of horses. He is a son of Cronus and Rhea, and brother to Zeus and Hades. He rules one of the three realms of the universe as king of the sea and the waters. In classical artwork, he was depicted as an older man with a very large beard, and holding a trident. The horse and the dolphin are sacred to him. His wife is Amphitrite. The Roman version of Poseidon was Neptune.