Nielsen Hayden genealogy
Descendants of Ieuan ap Gruffudd ap Hywel
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Father: Gruffudd ap Hywel ap Maredudd ab Einion
(Abt 1270 - ??)
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Ieuan ap Gruffudd ap Hywel (Abt 1300 of Eifionydd, Caernarvonshire, Wales - ??)
   
Dafydd Fychan ap Dafydd Llwyd ap Cynwrig
(of Trefeilir in Malltraeth, Anglesey, Wales - ??)
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       └─ 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)