Family: Iorwerth Drwyndwn 'The Broken Nose' 'King of Gwynedd / Marared verch Madog (F14962)
m. 1163
The parent family of Llywelyn ab Iorwoerth is the Birth Family.
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 | Owain Gwynedd (1100-1170)
|
 | Gwenlian Verch Ednowain (1100-1169) |
| Angharad verch Owain Gwynedd (1130-1189) |
| Gwenllian ferch Owain (1130-1197) |
| Madog ap Maredudd ( -1160)
|
| Susanna ferch Gruffudd (1095-1165)
|
| Margaret (1121- ) |
| Elissan (1127- ) |
| Marared (Margaret) ferch Madog (1129-1224) |
| Lord Gruffudd Maelor ap Madog, Lord of Bromfield (1130-1191) |
| Gwenllian Verch Madog (1131-1198) |
| Iorwerth ap Madog (1134- ) |
| Gwenllian Verch Madog (1135-1177)  |
| Llywellan (1137-1159) |
| Owain Fychan (1139- ) |
| Maret (1143- ) |
| Gwendolyn (1145- ) |
| Gruffydd ap Madog, Prince of Powys (1121-1191) |
| Marared verch Madog (1129-1198)
|
| Llewelyn Fawr Wales ApIorwerth (1130-1184) |
| Dafydd Ap Iorwerth (1167-1203) |
| Llywelyn ab Iorwoerth (1173-1240) |
| Adda Ap Iorwerth Drwyndwn (1175-1240) |
| Catherine Verch Owain (1175- ) |
| Catherine Verth Gwynedd (1175- ) |
| Vychan ap Liewelyn (1238- ) |
| Margaret ApIthel (1390- ) |
| Ievan ap Owain Gwynedd ( -1195) |
| Davydd Iorwerth ( -1203) |
| Dafydd ap Madog Llwyd ( -1399) |