Poseidon is known as the Greek god of the sea, earthquakes, and horses. He is one of the Twelve Olympian deities and is often depicted holding a trident, which symbolizes his power over water and is associated with tempestuous seas and storms. Poseidon was highly revered by seafarers, who offered sacrifices to him for safe voyages and bountiful catches. He played a significant role in various myths and stories, including the creation of horses and his rivalry with Athena for the patronage of Athens. His personality is often characterized as moody and vengeful.