Stammbaum:
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William "Mafonache" Fitzrobert < Hawise Fitzrobert < Robert Fitzwilliam < Mabel Fitzrobert < Amice Fitzrobert < Isabel Fitzrobert Geschwister Isabel (Elizabeth) "De Beaumont" Leicester Gervace de Beaumont William de Beaumont John de Beaumont Geoffrey de Beaumont Henry de Beaumont Margaret de Beaumont Robert "Blanchmains" Harcourt |