Nielsen Hayden genealogy
(Unknown wife or mistress of Gruffudd ap Cynan)
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| Cadwgon ap Bleddyn ap Cynfyn | |
| D: | 1111 |
Gruffydd ap Cynan ab Iago, King of Gwynedd
Abt 1055-1137
| Gruffydd ap Cynan ab Iago, King of Gwynedd | |
| B: | Abt 1055 |
| D: | 1137 |