Wikipedia: Gilbert de Clare, 1st Earl of Pembroke, citing Cokayne's Complete Pee...

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Wikipedia: Gilbert de Clare, 1st Earl of Pembroke, citing Cokayne's Complete Peerage, volume VII, pages 351; 526, footnote; Richard de Clare, 2nd Earl of Pembroke: 352-57, Appendix H, pp. 102-04, archive.org (vol. VII). Note - page 526 in volume VII pertains to the Earl of Leicester, but the other pages and Appendix H must be in a different volume. George Edward Cokayne, The Complete Peerage; or,A History of the House of Lords and All its Members from the Earliest Times, Vol. VII, Eds. H. A. Doubleday & Howard de Walden (London: The St. Catherine Press, Ltd., 1929).

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