/Robert de Quincy
        /Saher (or Saire) de Quincy
       |    \Orable de Leuchars
    /Robert de Quincy
   |   |    /Robert III "Blackmaine" de Beaumont
   |    \Margaret de Beaumont
   |        \Petronilla (or Pernell) de Grentmesnil
Joan de Quincy
   |        /Iorwerth (or Jorwerth) ap Owain
   |    /Llewelyn "the Great" ap Iorwerth
   |   |    \Marared (Margaret) v Madog ap M'dd
    \Helen v Llewelyn
       |    /John "Lackland" of England
        \Joan of England
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