The Greek god of the sea is Poseidon. In ancient mythology, Poseidon is one of the Twelve Olympian deities and is known not only as the god of the sea but also of earthquakes and horses. He is often depicted wielding a trident, a three-pronged spear, which symbolizes his dominion over the oceans. Poseidon played a significant role in various myths and stories, including his rivalry with Athena over the city of Athens. Revered by sailors and associated with both benevolence and storms, Poseidon remains a prominent figure in Greek mythology and culture.