The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
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 | Constance "Wen" ferch Cadwgon (1030- ) |
| Nest ferch Iestyn (1070- )  |
| Gwenllian ferch Iestyn (1070- ) |
| Catrin ferch Iestyn (1070- ) |
 | Rhiwallon ab Iestyn (1070- ) |
| Cynwrig ab Iestyn (1070- ) |
| Iorwerth ab Iestyn (1070- ) |
| Gruffudd ab Iestyn (1070- ) |
| Cadwgon ab Iestyn (1070- ) |
| Richard ab Iestyn (1070- ) |
| Gearnad ab Iestyn (1070- ) |
| Ieuan ab Iestyn (1070- ) |
| Madog ab Iestyn, arglwydd of Rhuthin (1100- ) |
| Rhys ab Iestyn, arglwydd of Resolfen (1100- ) |
| Caradog ab Iestyn, arglwydd of Afan (1070- )
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| Gwladus ferch Gruffudd (1100- ) |
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