How is Neptune related to Poseidon Zeus?

Neptune is the Roman equivalent of Poseidon, the Greek god of the sea. Both deities are associated with water, earthquakes, and horses. Zeus, in Greek mythology, is the king of the gods and brother to Poseidon, while his Roman counterpart is Jupiter. Thus, Neptune and Poseidon share a direct connection as sea gods, with Zeus and Jupiter serving as their respective rulers in the pantheon.