Margaret Plantagenet: Birth: 1275. Death: 1318
Thomas de Brotherton: Birth: 1 JUN 1300. Death: UNKNOWN
Title: "Burkes' Genealogical and Heraldic History of the Peerage, Baronetage and Knightage"
Author: Sir John Bernard Burke
Title: Royal and Noble Genealogical Data on the Web
Author: Brian Tompsett
Title: The Complete Peerage
Author: G. E. Cokayne
Publication: St. Catherines Press 1953
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