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W E Wightman, *The Lacy Family in England and Normandy, 1066-1194*,
genealogical chart following p 260.
From same, p 175, 177-178: Eustace fitz John, Payn's eldest brother, married Beatrice, the Vesci heiress, and thus inherited through her the honours of Alnwick and Malton. Their son assumed the surname Vesci, it being this William whose sister probably married Henry I de Lacy of Pontefract. By his second marriage Eustace had a son Robert. He in his turn married Aubrey de Lisours, daughter of Aubrey the sister of Ilbert II de Lacy, through whom the Pontefract honour descended in 1194 to Roger de Lacy, grandson of Robert fitz Eustace. Since the king's permission for the marriage of Robert de Lisours with Aubrey de Lacy was only obtained in 1129-30, this family link between the holder of the western Lacy lands and the Pontefract family has little significance for the time of Payn fitz John, save to demonstrate that at least two of the sons of John 'Monoculus' were of sufficient standing to be acceptable husbands for the daughters of major barons.