Roger de Quincy (his elder brother, Robert, being still in the Holy Land), had livery of his father's estates and he subsequently s. to the Earldom of Winchester. This nobleman marrying Helen, eldest dau. and co-heir of Alan, Lord of Galloway, became, in her right, constable of Scotland. By this lady he had issue, Margaret, Elizabeth, and Ela, m. to Alan, Lord Zouch, of Ashby.
His lordship m. 2ndly, Maud, dau. of Humphrey de Bohun, Earl of Hereford (widow of Anselme Mareschall, Earl of Pembroke), and 3rdly, Alianore, dau. of William de Ferrers, Earl of Derby, and widow of William de Vaux (this lady survived the earl and m. after his decease, Roger de Leybourne). Dugdale says that the earl had another dau., but by which wife he could not discover, namely, Isabell, with whom a contract of marriage was made, by John, son of Hugh de Nevil, for his son, Hugh.
His lordship d. in 1264, when the Earldom of Winchester became extinct, and his great landed possessions devolved upon his daus., as co-heiresses. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 447, Quincy, Earls of Winchester]