Nielsen Hayden genealogy
Descendants of Cadwgon ap Madog ap Cadwgon ap Bleddyn
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Mother: Jane ferch Cynwrig
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Cadwgon ap Madog ap Cadwgon ap Bleddyn
   └─ Madog ap Cadwgon ap Madog ap Cadwgon
(Abt 1170 of Nannau, Meirionnydd, Wales - ??)
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               └─ (Unknown daughter of Thomas ap Rhodri)
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Maredudd ab Owain ap Gruffudd ab Yr Arglwydd Rhys
( - Mar 1265 Llanbardarn Fawr, Ceredigion,
                Wales)
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                Wales)
                   └─ Owain ap Maredudd ab Owain ap Gruffudd
(of Iscoed, Ceredigion, Wales -
                    15 Aug 1275 bur.Strata Florida Abbey, Ceredigion, Wales)
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                    15 Aug 1275 bur.Strata Florida Abbey, Ceredigion, Wales)
                   
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                       └─ Llywelyn ab Owain ap Maredudd ab Owain
(of Cedewain, Powys, Wales - 1309)
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                           └─ Thomas ap Llewellyn ab Owain ap Maredudd
(of Iscoed, Ceredigion, Wales -
                            1343) =>
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                            1343) =>
                            + Elinor ferch Maredudd
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