The Greek god of the sea, known for wielding a trident, is Poseidon. Poseidon is one of the Twelve Olympians and represents not only the sea but also earthquakes and horses. His power over the waters made him a crucial deity for sailors and fishermen in ancient Greece. He is often depicted with his trident, which symbolizes his authority and ability to control the ocean's waves and storms. Myths involving Poseidon reflect the capricious nature of the sea, embodying both its beauty and danger.