Pedigree

            /Sancho IV de Castile
        /Ferdinand IV "the Summoned" de Castile and Leon
       |    \Maria de Molino
    /Alphonso XI "the Just" Castile & Leon
   |   |    /Diniz de "o Justo" Portugal
   |    \Constance of Portugal
   |        \Isabel De Aragon
Pedro I "the Cruel" Castile
   |    /Alphonso IV "O Osado" Portugal
    \Maria of Portugal
        \Beatrice de Castile

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