Greek sea gods conform to a single type: that of Homer's "halios geron" or Old Man of the Sea: Nereus, Proteus, Glaucus and Phorkys. These sea gods are not as powerful as Poseidon, the main god of the oceans and seas. Each one is a shape-shifter, a prophet, and the father of either radiantly beautiful nymphs or hideous monsters (or both, in the case of Phorkys). Nymphs and monsters blur, for Hesiod relates that Phorcys was wed to the "beautiful-cheeked" Ceto, whose name is merely the feminine of the monstrous Cetus, to whom Andromeda was due to be sacrificed. Each appearance in myth
Old Man of the Sea Old Man of the Sea In Greek mythology, the Old Man of the Sea () was a primordial figure who could be identified as any of several water-gods, generally Nereus or Proteus, but also Triton, Pontus, Phorcys or Glaucus. He is the father of Thetis (the mother of Achilles). In book 4 of Homer's "Odyssey", Menelaus recounts to Telemachus his journey home, and how he had to seek the advice of the Old Man of the Sea. The Old Man can answer any questions if captured, but capturing him means holding on as he changes from one form to another.