Oceanus

Oceanus was one of the elder Titans, the son of Gaia and Ouranos who ruled the infinite waters of the young cosmos before Poseidon wrested the seas from him. Known as the great river that girdled the world, he stood with his kin against the Olympians, was diminished but not imprisoned, and rose a final time during the siege of Mount Olympus before Hades cast him down. (Theogony; God of War II (novel); God of War III)

The Titan of the Ocean#

Oceanus was one of the elder Titan sons of Gaia and Ouranos, the great river that girdled the world. With his wife Tethys he fathered thousands of children, the sea and river spirits called Oceanids, among them Metis and Amphitrite, who would later become wives of Zeus and Poseidon. (Theogony; Bibliotheca)

The loss of the seas#

The old myths have Oceanus side with the young gods: Hesiod tells how, on his father's advice, Oceanus's daughter Styx came with her children to fight for Zeus. The novelisation of God of War II tells it differently. There Poseidon recalls that Oceanus and his children were fierce enough that it took the water of every sea and lake in the world to beat them, and Poseidon became the new lord of the oceans. (Theogony; God of War II (novel))

Though deposed, Oceanus evaded the imprisonment in Tartarus that claimed most of his kin. In the novelisation he stirs again as Kratos nears the Sisters of Fate, defying Poseidon's mastery of the sea, while Zeus dismisses him as the least of the Titans. (God of War II (novel))

The siege of Olympus#

Oceanus rose a final time during the siege of Mount Olympus, appearing as a vast Titan of water and lightning. An electric current ran through most of his form, and his currents did massive damage to the surrounding mountain as he climbed. He was pulled from Olympus by Hades, who then leapt down after him. Some held that Oceanus had in fact dragged Hades down with him, but in either case the Titan was assumed to have perished in the fall, one more of the old powers swept away as the wars of the gods drew toward their end. (God of War III)