Nielsen Hayden genealogy
Descendants of Angharad ferch Ithel Fychan ab Ithel Gam ap Hen Ithel Gam ap Maredudd ab Uchdrud ab Edwin
Father: Ithel Fychan ab Ithel Gam ap Hen Ithel Gam ap Maredudd (Abt 1230 - ??)
Angharad ferch Ithel Fychan ab Ithel Gam ap Hen Ithel Gam ap Maredudd ab Uchdrud ab Edwin (of Tegeingl, Wales - ??)
   └─ Gronwy ap Tydyr HĂȘn ap Gronwy (of Penmynydd, Anglesey, Wales - 1331 bur.Bangor, Gwynedd, Wales)
    Gwerfyl ferch Madog (of Hendwr in Edeirnion, Merionethshire, Wales - Aft 1293)
       └─ Tudur ap Gronwy ( - 1367 Trecasteil, Anglesey, Wales)
        Margred ferch Thomas (of Iscoed, Ceredigion, Wales - ??)
            + Margred ferch Dafydd Vychan (of Trefeilir in Malltraeth, Anglesey, Wales - ??)