The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
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 | Thomas ap Gwilym (1350-1438)
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| Gwilym ap Jenkin (1370- ) |
 | Jane ferch Llywelyn "Fychan" (1430- )
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| Rhys "Gôch" ap Gwilym (1400- ) |
| Llywelyn ap Gwilym (1400- )  |
| Ieuan ap Thomas (1370- )
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| Margred ferch Gwilym (1400- )
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| John ab Ieuan (alias John Thomas) (1430- ) |
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