The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
 MaleGwallter ap Trahaearn |
| Birth | Abt 1270 | of, , Monmouthshire, Wales  |
| Death | Yes, date unknown | |
| Burial | ||
| Marriage | ||
| Father | ||
| Mother | ||
 FemaleJoyce ferch Adam |
| Birth | Abt 1270 | of, Y Wern-ddû, Llandeilo Bertholau, Monmouthshire, Wales |
| Death | Yes, date unknown | |
| Burial | ||
| Father | Adam ap Cynhaethwy, arglwydd of Llanllywel, arglwydd of Beachley | F274274 Group Sheet | |
| Mother | Cristin ferch Gwarin "Ddû" | F274274 Group Sheet | |
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