Nielsen Hayden genealogy
Family: Owain Gwynedd, King of Gwynedd / Gwladus ferch Llywarch (F1660)
Gruffydd ap Cynan ab Iago, King of Gwynedd (1055-1137) 
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Angharad ferch Owain ( -1162)
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Gwenllian ferch Gruffudd ( -1136)  |
| Llywarch ap Trahearn ( -1125)
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| Owain Gwynedd, King of Gwynedd ( -1169)
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| Iorwerth Drwyndwn ap Owain Gwynedd ( -1174) |