In Greek mythology, any of the daughters of the sea god Nereus and of Doris, daughter of Oceanus. The Nereids, who numbered 50 or 100, were depicted as young girls who inhabited any water, salt or fresh, and were benign toward humanity. They were popular figures in Greek literature. The best known were Amphitrite, consort of Poseidon; Thetis, wife of Peleus (king of the Myrmidons) and mother of Achilles; and Galatea, a Sicilian loved by the Cyclops Polyphemus.
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In Iliad XVIII, when Thetis cries out in sympathy for the grief of Achilles for the slain Patroclus,
There gathered round her every goddess, every Nereid that was in the deep salt sea. Glauce was there and Thaleia and Cymodoce; Nesaea, Speio, Thoe and ox-eyed Halie; Cymothoe, Actaee and Limnoreia; Melite, Iaera, Amphithoe and Agaue; Doto, Proto, Pherusa and Dynamene; Dexamene, Amphinome and Callianeira; Doris, Panope and far-sung Galatea; Nemertes, Apseudes and Callianassa. Clymene came too, with Ianeira, Ianassa, Maera, Oreithuia, Amatheia of the lovely locks, and other Nereids of the salt sea depths. The silvery cave was full of nymphs.