Family: Owain Gwynedd GRUFFYDD / Gwenlian Verch Ednowain (F14964)
The parent family of Iorwerth Drwyndwn ap Owain Gwynedd is the Birth Family.
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 | King Gruffydd ap Cynan (1050-1137)
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 | Angarad Ferch Owain (1065-1162)
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| Margred Verch Rhys, de Heubarth (1089- ) |
| Rhanullt (1083- ) |
| Gwenllian ferch Gruffydd (1085-1136) |
| Gwenllian ferch Gruffydd (1085-1136) |
| Elen (1089- ) |
| Merinedd (1091- ) |
| Susanna ferch Gruffudd (1095-1165)  |
| Cadwaladr ap Gruffydd (1096-1172) |
| Cadwallon Ap Gruffydd (1097-1132) |
| Annest Verch Gruffudd (1105- ) |
| Membyr "Ddu" Ap GRUFFUDD (1114-1169) |
| Rhael (1116- ) |
| Owain Gwynedd GRUFFYDD (1087-1169)
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| Gwenlian Verch Ednowain (1100-1169) |
| Iorwerth Drwyndwn ap Owain Gwynedd (1145-1170) |