The De Vere Society, Oxford Pedigree Tree (pdf), which notes information is most...

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The De Vere Society, Oxford Pedigree Tree (pdf), which notes information is mostly from The Complete Peerage, but CP lists only Robert, Isabel, Laura, and Margaret. G. E. Cockayne, The Complete Peerage (London, England: St. Catherine Press, 1945), Volume X, p 215. See WikiTree's source page for The Complete Peerage for links to online copies.

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