Nielsen Hayden genealogy
Family: Gruffydd ap Rhys / Gwenllian ferch Gruffudd (F15914)
Rhys ap Tewdyr, King of Deheubarth ( -1093) 
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| Gruffydd ap Cynan ab Iago, King of Gwynedd (1055-1137)
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Angharad ferch Owain ( -1162)
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Owain Gwynedd, King of Gwynedd ( -1169)  |
| Gruffydd ap Rhys (1090-1137)
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| Gwenllian ferch Gruffudd ( -1136)
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| Rhys ap Gruffydd, King of Deheubarth (1132-1197) |