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