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--- W E Wightman, *The Lacy Family in England and Normandy, 1066-1194*,
genealogical chart following p 175, 177-178.
All that can be said of John 'Monoculus' is that he was not an important member of the baronage. A measure of his respectability -- or rather acceptability in the eyes of the rest of his contemporaries -- is to be found in the marrige of his sons, Payn, a younger son, married the Lacy heiress. Eustace fitz John, Payn's eldest brother, married Beatrice, the Vesci heiress, and thus inherited through her the honours of Alnwick and Malton.
At least two of the sons of John 'Monoculus' were of sufficient standing to be acceptable husbands for the daughters of major barons.