Family: Owain Gwynedd / Gwladys Llywarch (F14963)
The parent family of Iorwerth Drwyndwn ap Owain Gwynedd is the Birth Family.
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 | Gruffudd ap Cynan (1055-1137)
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 | Angharad ferch Owain (1065-1162)
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| Susanna ferch Gruffudd (1090-1165) |
| Gwenllian ferch Gruffydd (1100-1136) |
| Owain Gwynedd (1100-1170)
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| Gwladys Llywarch (1478- ) |
| Iorwerth Drwyndwn ap Owain Gwynedd (1145-1170)  |