Nielsen Hayden genealogy
Descendants of Angharad ferch Maredudd
Father: Maredudd ap Madog
Angharad ferch Maredudd
Llywelyn ap Gruffudd ap Cadwgan ap Meilir Eutun (Abt 1230 - ??)
   └─ Lleucu ferch Llywelyn ap Gruffudd
    Iorwerth ap Madog ap Gruffudd ab Owain Brogyntyn
       └─ Madog ab Iorwerth ap Madog ap Gruffudd
        Efa ferch Llywelyn ap Gruffudd
           └─ Gwerfyl ferch Madog (of Hendwr in Edeirnion, Merionethshire, Wales - Aft 1293) =>
            + Gronwy ap Tydyr HĂȘn ap Gronwy (of Penmynydd, Anglesey, Wales - 1331 bur.Bangor, Gwynedd, Wales)