The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
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 | Gronwy ap Caradog (1230-1251)
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| Llywelyn ab Owain, arglwydd of South Ceredigion (1250-1309)
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 | Gwanas ferch Thomas (1250- )
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| Elen [2nd] ferch Llywelyn (1270- )  |
| Isabel ferch Llywelyn (1270- ) |
| Lleucu [1st] ferch Llywelyn (1270- ) |
| Elen [1st] ferch Llywelyn (1300- ) |
| Gwenllian ferch Llywelyn (1300- ) |
| Lleucu [2nd] ferch Llywelyn (1300- ) |
| Thomas ap Llywelyn, arglwydd of South Ceredigion (1300-1343) |
| Rhys ap Gronwy, lord of Glyn-nedd (1270- )
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| Joan ferch Llywelyn (1300- )
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| Joan ferch Rhys (1270- ) |
| Llywelyn ap Rhys (1300-1360) |
| Gruffudd ap Rhys (1300- ) |
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