The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
 MaleMadog ab Iestyn, arglwydd of Rhuthin |
| Birth | Abt 1100 | of, Rhuthin, Eglwys Fair y Mynydd, Glamorganshire, Wales  |
| Christening | {Tribe: Iestyn ap Gwrgan} |
|
| Death | Yes, date unknown | |
| Burial | ||
| Marriage | ||
| Father | Iestyn ap Gwrgan, arglwydd of Morgannwg | F141624 Group Sheet | |
| Mother | Constance "Wen" ferch Cadwgon | F141624 Group Sheet | |
 FemaleJonet ferch Ynyr "Fychan" |
| Birth | Abt 1100 | of, , Monmouthshire, Wales |
| Christening | {Tribe: Ynyr Gwent} |
|
| Death | Yes, date unknown | |
| Burial | ||
| Father | Ynyr "Fychan" ap Meurig | F152872 Group Sheet | |
| Mother | Gwladus ferch Rhys "Gôch" | F152872 Group Sheet | |
| Male + Hywel ap Madog |
| Birth | Abt 1130 | of, Meisgyn commote, Glamorganshire, Wales |
| Christening | {Tribe: Iestyn ap Gwrgan} |
|
| Death | Yes, date unknown | |
| Burial | ||
| Spouse | Mawd ferch Gruffudd | F141582 | |
| Marriage | ||
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