Poseidon (Greek: π ο σ ε ι δ? ν, also translated as Poseidon), the god of the sea in Greek mythology (also the mythical horse god who brought horses to mankind), the brother of Zeus. Its symbol is Poseidon Trident. Corresponding to Nippon in Roman mythology, Neptune's Latin name comes from him. His mount is a golden chariot driven by a white horse. His weapon is a trident.