Abt 1265 - 1333 (~ 68 years)
| Madog ap Ieuan Abt 1390-1416 |
| Madog ap Ieuan | |
| B: | Abt 1390 |
| Llanystumdwy, Caernarvonshire, Wales | |
| D: | Aft. 1416 |
 | Gwerfyl ferch Rhys Abt 1400- |
| Gwerfyl ferch Rhys | |
| B: | Abt 1400 |
| Wales | |
| Ieuan ap Einion Abt 1335-Abt 1399 |
| Ieuan ap Einion | |
| B: | Abt 1335 |
| Wales | |
| D: | Abt 1399 |
| Gwenhwyfer ferch Ynyr Vychan Abt 1365- |
| Gwenhwyfer ferch Ynyr Vychan | |
| B: | Abt 1365 |
| Wales | |
| Nest ferch Gruffydd Abt 1300- |
| Nest ferch Gruffydd | |
| B: | Abt 1300 |
| Wales | |
| Einion ap Gruffudd Abt 1300- |
| Einion ap Gruffudd | |
| B: | Abt 1300 |
| Dol-y-penrhyn, Llannor, Caernarvonshire, Wales | |
|
| Gruffydd ap Adda Abt 1265-1333 |
| Gruffydd ap Adda | |
| B: | Abt 1265 |
| Tywyn, Merionethshire, Wales | |
| D: | 1333 |
| Gwynedd, Wales | |
