When Hercules was ordered to fetch the golden apples of the Hesperides, he went to the Nymphs inhabiting the grottoes of Eridanus, to know where he might find them; the Nymphs sent him to Nereus, who, to elude the inquiry, perpetually varied his form, till Hercules having seized him, resolved to hold him till he resumed his original shape, on which he yielded the desired information. Nereus had, by his sister Doris, fifty daughters called Nereids. Hesiod highly celebrates him as a mild and peaceful old man, a lover of justice and moderation. Nereus and Doris, with their descendants the Nereids, or Oceaniads, so called from Oceanus, are ranked in the third class of water deities.