Pedigree

            /Afonso IV de Portugal
        /Pedro I de Portugal
       |    \Beatrix de Castile
    /Joao I de Portugal
   |    \Teresa Gille Lourenco
Isabella de Portugal
   |        /Edward III of England
   |    /John of England
   |   |    \Philippa van Holland
    \Philippa of Lancaster
       |    /Henry of Lancaster
        \Blanche of Lancaster
            \Isabel de Beaumont

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