The Nereids are the fifty daughters of Nereus and Doris who dwell in the Mediterranean Sea. These beautiful women were always friendly and helpful towards sailors fighting perilous storms. They are believed to be able to prophesize. They belong to the retinue of Poseidon.
In ancient art, particularly on black-figured Greek vases the Nereids were portrayed fully clothed, such as on a Corinthian vase (6th century BC) where they stand around Achilles' deathbed, dressed in mourning-garbs. In later art they were portrayed naked or partially naked, riding on dolphins, seahorses, and other marine creatures.