The Greek god of the sea is Poseidon. In ancient mythology, Poseidon was one of the twelve Olympian deities and was revered as the god of the ocean, earthquakes, and horses. He is often depicted wielding a trident, which symbolizes his power over water and his ability to create storms and earthquakes. As a significant deity in Greek culture, Poseidon was associated with various myths and legends, including the creation of horses and his rivalry with Athena for the patronage of cities. His worship involved rituals at coastal temples and festivals, underscoring the importance of the sea in ancient Greek society.