Nielsen Hayden genealogy
Descendants of Gwerfyl ferch Madog
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Mother: Efa ferch Llywelyn ap Gruffudd
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Gwerfyl ferch Madog (of Hendwr in Edeirnion, Merionethshire, Wales - Aft 1293)
       
Margred ferch Dafydd Vychan
(of Trefeilir in Malltraeth, Anglesey, Wales - ??)
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           └─ Owen ap Maredudd ap Tudur
(Abt 1400 - 4 Feb 1461 Hereford, Herefordshire, England) =>
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            + 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)
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            3 Jan 1437 Bermondsey Priory, Surrey, England)(m. Between 1429 and 1430)