|  Male Iorwerth Drwyndwn Ap Owa | 
| Birth | Wales  | |
| Death | 1174 | Wales  | 
| Burial | ||
| Marriage | ||
| Father | Owen Gwinedh | F36405 Group Sheet | |
| Mother | Gwladys Ferch Llywarch | F36405 Group Sheet | |
|  Male Iorwerth Ap Llewellyn | 
| Birth | 1164 | Aberffraw, Anglsy, Wales  | 
| Death | 1240 | Aberconwy, Arllechwedd Isaf, Caernarvonshire, Wales  | 
| Burial | ||
| Spouse | Joanna Plantagenet | F36403 | |
| Marriage | ||
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