Nielsen Hayden genealogy
Family: Owain ap Gruffudd ab Yr Arglwydd Rhys / (Unknown daughter of Gwion Sais) (F15928)
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Father | Male
Owain ap Gruffudd ab Yr Arglwydd Rhys
Born Died 18 Jan 1236 Strata Florida Abbey, Ceredigion, Wales 
Buried Strata Florida Abbey, Ceredigion, Wales 
Married Father Gruffudd ab Yr Arglwydd Rhys | F15929 Group Sheet Mother Matilda de Briouze | F15929 Group Sheet
Mother | Female
(Unknown daughter of Gwion Sais)
Born Died Buried Father Gwion Sais ap Heilin ap Llywarch ap Gwyn | F15930 Group Sheet Mother
Child 1 | Male
+ Maredudd ab Owain ap Gruffudd ab Yr Arglwydd Rhys
Born Died Mar 1265 Llanbardarn Fawr, Ceredigion, Wales 
Buried Strata Florida Abbey, Ceredigion, Wales 
Spouse (Unknown daughter of Thomas ap Rhodri) | F15924 Married