Nielsen Hayden genealogy
Descendants of Maredudd ab Owain ap Gruffudd ab Yr Arglwydd Rhys
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Father: Owain ap Gruffudd ab Yr Arglwydd Rhys
( - 18 Jan 1236 Strata Florida Abbey, Ceredigion, Wales)
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Mother: (Unknown daughter of Gwion Sais)
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Maredudd ab Owain ap Gruffudd ab Yr Arglwydd Rhys ( - Mar 1265 Llanbardarn Fawr, Ceredigion, 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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