In Greek mythology, Poseidon was the god who ruled the sea and was known for causing earthquakes.
Poseidon was one of the twelve Olympians and a son of the Titans Cronus and Rhea. After the overthrow of the Titans, he and his brothers Zeus and Hades divided the cosmos by lot. Poseidon received dominion over the sea, while Zeus ruled the sky and Hades ruled the Underworld.
His most famous symbol was the trident, which he could use to stir the sea, create springs, or shake the earth. Greek communities often worshipped him as a protector of sailors, although his temper could be dangerous. He was also associated with horses, especially in regions where water springs and horse cults were important.
Poseidon is sometimes confused with Neptune, but Neptune is the Roman equivalent. The Greek god’s major cult center was at Sounion, where a famous temple still overlooks the Aegean Sea.