Pedigree

        /John De Burgh Earl Of Ulster
    /William De Burgh Earl Of Ulster
   |   |    /Gilbert De Clare
   |    \Elizabeth De Clare Baroness Damory
   |        \Joan of Acre Plantagenet
Elizabeth De Burgh Countess Of Ulster
   |        /Edmund Earl Of Lancaster 1st\Leicester
   |    /Henry Plantagenet KG Earl Of Lancaster 3rd
   |   |    \Blanche D'Artois Capet Queen Of Navarre
    \Maud Plantagenet
       |    /Sir Patrick de Chaworth
        \Maud de Chatworth
            \Isabel de Beauchamp

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