Pedigree

            /Trahearn ap GWGON
        /Hywel ap TRAHAEARN
       |    \Gwenllian ferch RHYS
    /Rhys ap HYWEL
   |   |    /Gruffydd ap IFOR BACH
   |    \Nest ferch GRUFFUDD
   |        \Mabel de GLOUCESTER
Dafydd ap RHYS Y DIDIMAU
    \Catrin ferch GRUFFUDD

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