Poseidon (Poe-Sai-Done), as the god of the seas held great importance for the ancient Greeks. Just as Zeus ruled the sky and wielded the deadly thunderbolt, Poseidon controlled, from his sea-domain, the devastating force of the earthquake. This ability to summon earthquakes earned Poseidon the epithet of "Earth Shaker", a name that is fairly common in Greek poetry and literature. He was known as “Neptune” in Roman mythology.

Splendid white chariot horses with brazen hooves and golden manes pulled am awesome golden chariot that transported the sea god around. Poseidon lived in a magnificent palace beneath the sea, off Aegae in Euboea. Triton, his son- who was half man, half fish would blow on his seashell to announce Poseidon's arrival.

After Zeus, with his brothers and sisters, defeated the Titans and dethroned Cronus, the three brothers drew lots out of a helmet to determine which one of the three realms each would rule. Zeus won the heavens and thus became the supreme ruler, Hades got the Underworld and Poseidon got the sea. The Earth remained common to all three.

When he was in a good mood, Poseidon created new lands in the water and a calm sea. In contrast, when he was in a bad mood, Poseidon would strike the ground with a trident and cause unruly springs and earthquakes, ship wrecks, and drowning.

Spent much of his time participating in the festivities in Olympus with the other gods.

Many Sea-monsters were unleashed by Poseidon to exact vengeance: Poseidon sent a Sea-monster against the Teucrians because Hierax, a righteous man, was devoted to Demeter and would not honor Poseidon. At another time, Poseidon sent a bull from the sea, and the horses of Hippolytus were startled, entangling their master in the reins, dragging him to a horrible death.

He created the first horse, and it was accepted that he instituted horse-racing. He even claimed to have constructed the first horse bridle (obviously!).

At his command winds rose and the most violent of storms began, but when he drove in his golden chariot over the water, the storms subsided and tranquil peace followed his wheels.