In Greek mythology, the nymph daughters of the Titan Oceanus (Ocean), were known collectively as the Oceanids. Four ancient sources give lists of names of Oceanids. The oldest, and longest such list, given by the late 8th–early 7th century BC Greek poet Hesiod, names 41 Oceanids. Hesiod goes on to say that these "are the eldest ... but there are many besides" and that there were "three thousand" Oceanids, a number interpreted as meaning "innumerable". While some of these names, such as Peitho, Metis and Tyche, certainly reflected existing traditions, many were probably mere poetic inventions. The probably nearly as old Homeric Hymn to Demeter lists 21 names, 16 of which match those given by Hesiod, and were probably taken directly from there.