Sir (2 syl.). Brother of Elaine', and son of the lord of Astolat. He accompanied Sir Lancelot when he went, incognito, to tilt for the ninth diamond. Lavaine is described as young, brave, and a true knight.
(Tennyson Idylls of the King, Elaine.)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894