Nielsen Hayden genealogy
Gwenllian ferch Owain Gwynedd
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| Gronwy ab Ednyfed Fychan ap Cynwrig ab Iorwerth | |
| B: | of Trecasteil, Anglesey, Wales |
| D: | 1268 |
| Tegwared y Baiswen ap Llywelyn ab Iorwerth Drwyndwn ab Owain Gwybnedd | |
| B: | Abt 1200 |
| Gruffudd ab Ednyfed Fychan ap Cynwrig ab Iorwerth | |
| D: | 1246 |
| Ednyfed Fychan ap Cynwrig ab Iorwerth ap Gwgon | |
| D: | 1246 |
| Gwenllian ferch Yr Arglwydd Rhys | |
| D: | 1236 |
| Cynwrig ab Iorwerth ap Gwgon ab Idnerth ab Edryd ab Inethan ab Iasedd ap Carwed ap Marchudd ap Cynan | |
| B: | Abt 1130 |
| Hwfa ap Cynwrig ap Rhiwallon ap Dingad ap Tudur Trefor | |
| B: | Abt 1130 |
Thomas ap Rhodri ab Owain Gwynned
Abt 1170-
| Thomas ap Rhodri ab Owain Gwynned | |
| B: | Abt 1170 |
Einion ap Seisyll
Abt 1170-
| Einion ap Seisyll | |
| B: | Abt 1170 |
Madog ap Cadwgon ap Madog ap Cadwgon
Abt 1170-
| Madog ap Cadwgon ap Madog ap Cadwgon | |
| B: | Abt 1170 |
| of Nannau, Meirionnydd, Wales | |