Nielsen Hayden genealogy
Descendants of Gwerfyl ferch Madog
- Aft 1293Mother: 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)
   └─ Tudur ap Gronwy ( - 1367 Trecasteil, Anglesey, Wales)
    Margred ferch Thomas (of Iscoed, Ceredigion, Wales - ??)
       └─ Maredudd ap Tudur ( - Aft 1406)
        Margred ferch Dafydd Vychan (of Trefeilir in Malltraeth, Anglesey, Wales - ??)
           └─ Owen ap Maredudd ap Tudur (Abt 1400 - 4 Feb 1461 Hereford, Herefordshire, England) =>
            + Catherine of Valois, Queen Consort of England (27 Oct 1401 Hotel de St. Pol, Paris, France -
            3 Jan 1437 Bermondsey Priory, Surrey, England)(m. Between 1429 and 1430)
            3 Jan 1437 Bermondsey Priory, Surrey, England)(m. Between 1429 and 1430)