Ophion was a Titan god who was the ruler of the Earth along with his wife, Eurynome. The couple was overthrown by Cronus and Rhea. He was overthrown when Cronus wrestled him for the throne, and when he defeated him, he cast him into the Ocean. His wife was simultaneously beaten by Rhea and suffered the same fate.
There is not much known about the old ruler, except that he was overthrown by Cronus and Rhea, who was then overthrown by the Olympian deities led by Zeus.