Sea in culture sea nymphs whose parents were Nereus and Doris. The Tritons, sons of Poseidon, who were variously represented with the tails of fish or seahorses, formed Poseidon's retinue along with the Nereids. The mythic sea was further peopled by dangerous sea monsters such as Scylla. Poseidon himself had something of the shifting character of the sea, presiding not only over the sea, but also earthquakes, storms and horses. Neptune occupied a similar position in Roman mythology. Another Greek sea-god, Proteus, specifically embodies the domain of sea change, the adjectival form "protean" meaning mutable, able to assume many forms. Shakespeare makes use
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