
 Abt 1255 - 1301  (46 years)
 Abt 1255 - 1301  (46 years)|  | Madoc Ap Ievan Dda  Abt 1340-Yes, date unknown | 
| Madoc Ap Ievan Dda | |
| B: | Abt 1340 | 
| Penllech, Carnarvonshire, Wales | |
| D: | Yes, date unknown | 
|  | Ales Verch Ieuan  Abt 1344-Yes, date unknown | 
| Ales Verch Ieuan | |
| B: | Abt 1344 | 
| Penllech, Carnarvonshire, Wales | |
| D: | Yes, date unknown | 
|  | Ieuan Ap David  Abt 1310-Yes, date unknown | 
| Ieuan Ap David | |
| B: | Abt 1310 | 
| Penllech, Carnarvonshire, Wales | |
| D: | Yes, date unknown | 
|  | Efa Verch Einion  Abt 1314-Yes, date unknown | 
| Efa Verch Einion | |
| B: | Abt 1314 | 
| Llwydiarth, Montgomeryshire, Wales | |
| D: | Yes, date unknown | 
|  | David Ap Trahaiarn  Abt 1275-1352 | 
| David Ap Trahaiarn | |
| B: | Abt 1275 | 
| Penllech, Carnarvonshire, Wales | |
| D: | 1352 | 
| Bardsey Isle, Carnarvonshire, Wales | |
|  | Mawd Verch David Lloyd  Abt 1279-Yes, date unknown | 
| Mawd Verch David Lloyd | |
| B: | Abt 1279 | 
| Penllech, Carnarvonshire, Wales | |
| D: | Yes, date unknown | 
| 
 | 
|  | Trahaearn Ap Madog  Abt 1255-1301 | 
| Trahaearn Ap Madog | |
| B: | Abt 1255 | 
| Lleyn, Carnarvonshire, Wales | |
| D: | 1301 | 
| Wales | |
|  | Gwenervyl Verch Madog  Abt 1257-Yes, date unknown | 
| Gwenervyl Verch Madog | |
| B: | Abt 1257 | 
| Lleyn, Carnarvonshire, Wales | |
| D: | Yes, date unknown | 
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