Nielsen Hayden genealogy
Madog ab Iorwerth ap Madog ap Gruffudd
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| Maredudd ap Tudur -Aft 1406 |
| Maredudd ap Tudur | |
| D: | Aft 1406 |
| Tudur ap Gronwy -1367 |
| Tudur ap Gronwy | |
| D: | 1367 |
| Trecasteil, Anglesey, Wales | |
Gwerfyl ferch Madog -Aft 1293 |
| Gwerfyl ferch Madog | |
| B: | of Hendwr in Edeirnion, Merionethshire, Wales |
| D: | Aft 1293 |
| Gronw ap Tydyr Hên ap Gronw | |
| B: | of Penmynydd, Anglesey, Wales |
| D: | 1331 |
