'HELEN (ELENA) DE QUINCY, of Brackley; d. sh. bef. 20 Aug. 1296; m. bef. 1242 Sir Alan la Zouche, d. 12 Aug. 1270, Baron Zouche of Ashby la Zouche, co. Leicester; Constable of the Tower of London, ... (SP IV: 142; Banks 1: 469, CP XII (2): 921-934; ES III.4/708).'