Phorcys and Ceto

Phorcys and Ceto personified more especially the hidden perils and terrors of the ocean. They were the parents of the Gorgons, the Græa, and the Dragon which guarded the golden apples of the Hesperides.

From: Berens, E.M. The Myths and Legends of Ancient Greece and Rome. New York: Maynard, Merril, & Co., 1880. Text in the public domain.