The god of the sea often depicted with a trident is Poseidon. As one of the twelve Olympian gods, Poseidon held dominion over the oceans, earthquakes, and horses. The trident symbolizes his power and authority, representing his ability to control waters and unleash storms. Poseidon plays a critical role in many myths, including the creation of the horse, reflecting the ancients' reverence for the sea and the forces of nature.