Nielsen Hayden genealogy
Family: Madog ap Maredudd, Prince of Powys Fadog / Susanna ferch Gruffydd ap Cynan (F4086)
Maredudd ap Bleddyn ap Cynfyn ( -1132) 
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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)  |
| Gwenllian ferch Gruffudd ( -1136) |
