(Ἰλάειρα), a daughter of Leucippus and Philodice, and a sister of Phoebe, together with whom she is often mentioned by the poets under the name of Leucippidae. Both were carried off by the Dioscuri, and llaeira became the wife of Castor. (Apollod.3.10.3; Schol. ad Lycoph. 511.)
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890