Lord of Duffryn Efnydd Gwerny
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| Iowerth Drwyndwn Ap Owain Mawr 1125-1174 |
| Iowerth Drwyndwn Ap Owain Mawr | |
| B: | 1125 |
| Aberffraw Castle, Aberffraw, Anglesey, Wales, United Kingdom | |
| D: | 1174 |
| Pennant Melangell, , Wales, United Kingdom | |
| Prince of Powys Madoc Ap Maremudd | |
| D: | 1160 |
| Winchester, Hampshire, England, United Kingdom | |
| Prince of Powys Maremudd Ap Bleddyn | |
| D: | 1132 |