Nielsen Hayden genealogy
Family: Llywelyn ap Gruffudd ap Gwenwynwyn / Margred ferch Mardedudd Goch ap Maredudd ab Iorwerth Fychan (F17622)
Gruffydd ap Gwenwynwyn ( -1286) 
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Hawise le Strange ( -1310)
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Margaret de la Pole ( -1336)  |
| Owen de la Pole ( -1293) |
| Llywelyn ap Gruffudd ap Gwenwynwyn ( -1295)
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