Nielsen Hayden genealogy
Family: Rhys ap Griffith / Margaret la Zouche (F20165)
m. Bef 1376Rhys ap Griffith ( -1356) 
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Joan de Somerville ( -1376)
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| Rhys ap Griffith (1325-1380)
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| Margaret la Zouche ( -1430) |
Thomas Griffith (1377-1433)  |