Poseidon

The King of the Seas
Poseidon is the son of Cronos and the brother to Zeus and Hades.

During the Great War against the Titans, Poseidon had an army of Cyclopses that not only fought with the gods, but alsocreated Poseidon's greatest weapon; the Trident of the Sea. With this three-pronged spear Poseidon could command all the beasts that roamed his seas and could make the sea do whatever he pleased.

This weapon was also a very useful tool inallowing him to defeat the great Titan Oceanus, who had controlled the entire Ocean before the Great War. The reason for this is because the weapon of Oceanus, a live serpent that could defend Oceanus and could be used as a whip, was an water creature and, therefore, was able to be contolled with the use of the Trident.

After the Great War, Poseidon chose the sea as his everlasting domain and had a temple much like Olympus consructed in its deepest reaches. Oceanus, though, could not be beated just because he had lost his greatest weapon. He joined forces with the next force to oppose the gods; the Giants.

God/Titan War
The Titans may have lost to the gods but the Giants, who had helped the gods, rebelled when the gods would not grant them power as they had promised. Oceanus sided with the Giants and the Giants gave him a new set of weapons; the Harpoon and the Net. With these weapons Oceanus capture Poseidon and Hades but was thwarted when Zeus sent his mighty earth shattering lightning bolt down at Oceanus and split him into pieces, therefore, spreading the ocean into five different parts.