The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
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 | Ieuan ap Cadwgon "Fawr" (1230- )
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 | Lleucu ferch Iorwerth (1230- )
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| Rhys ab Ieuan (1270- ) |
| Gruffudd ab Ieuan (1270- ) |
| Thomas ab Ieuan (1270-1328)  |
| Gwilym ab Ieuan (1270- ) |
| Cadwgon "Fychan" ab Ieuan (1270- )
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| Iorwerth ap Cadwgon "Fychan" (1300- ) |
| Ieuan ap Cadwgon "Fychan" (1300- ) |
| Gruffudd ap Cadwgon "Fychan" (1300-1384) |
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