Nielsen Hayden genealogy
Family: Gruffudd ab Yr Arglwydd Rhys / Matilda de Briouze (F15929)
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Rhys ap Gruffydd, King of Deheubarth (1132-1197)
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Gwenllian ferch Madog ( -1160)
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Gwenllian ferch Yr Arglwydd Rhys ( -1236)  |
| William de Briouze ( -1211)
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| Maud de St. Valéry (1150-1210)
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| William de Briouze ( -1210) |
| Reynold de Briouze ( -1227) |
| Margaret de Briouze (1181-1245) |
| Gruffudd ab Yr Arglwydd Rhys ( -1201)
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| Matilda de Briouze ( -1210)
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