Poseidon

Poseidon was one of the three brothers (with Zeus and Hades) who divided up the mortal world after the Olympians conquered the Titans. Poseidon's share of the world was the sea. Seemingly unrelated, he was also the God of earthquakes. Poseidon was an extremely powerful Deity, who ruled over all storms, both over the water and on land. He was frequently invoked by sailors, in hopes of safe sea passage. Poseidon was an older man, who carried his trident on most occasions.

He was a God of turbulent temper and often fought with mortals and Gods alike. One particular battle was with Athena, to determine which of them would have the capital city named for them. They both created something for the people, and the most useful item would win. Poseidon gave the people of Greece horses, but Athena created the olive. Which is why the capital of Greece was (and still is) Athens.

Though he was not honoured in the naming of the capital, there was a major temple to Poseidon at Sounio, at the top of a high bluff overlooking the sea. Ironically, Athena also had a temple nearby.

His wife's name was Amphitrite, and she was the daughter of Titans Oceanus and Tethys. Like the rest of his brethren, Poseidon was known for his affairs outside his marriage. He had a brief relationship with the Gorgon, Medusa, and since he came to her in the form of a horse, she gave birth to Pegasus.

In the Roman pantheon, Poseidon was known as Neptune.