The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
 MaleSeisyll ap Dyfnwal, arglwydd of Castell Arnallt |
| Birth | Abt 1140 | of, Castell Arnallt, Llangatwg Dyffryn Wysg, Llanofer Fawr, Monmouthshire, Wales  |
| Christening | {Tribe: Ynyr Gwent} |
|
| Death | 25 Dec 1177 | Y Fenni, Monmouthshire, Wales |
| Burial | ||
| Marriage | ||
| Other Spouse | Gwladus ferch Gruffudd | F152740 | |
| Marriage | Yes, date unknown | |
| Other Spouse | Annes Russell | F146900 | |
| Marriage | ||
| Father | Dyfnwal ap Caradog | F154955 Group Sheet | |
| Mother | Joyce [de Balladon] | F154955 Group Sheet | |
 FemaleDyddgu ferch Owain "Wan" |
| Birth | Abt 1100 | of, Caerllion, Llangadog, Monmouthshire, Wales |
| Christening | {Tribe: Rhydderch ap Iestyn} |
|
| Death | Yes, date unknown | |
| Burial | ||
| Father | Owain "Wan" ap Caradog, arglwydd of Caerllion | F146892 Group Sheet | |
| Mother | Mrs. Owain "Wan" ap Caradog | F146892 Group Sheet | |
| Male Morgan ap Seisyll |
| Birth | Abt 1160 | of, , Monmouthshire, Wales |
| Christening | {Tribe: Ynyr Gwent} |
|
| Death | Aft 1171 | |
| Burial |
| Female + Gwladus ferch Seisyll |
| Birth | Abt 1160 | of, Castell Arnallt, Llangatwg Dyffryn Wysg, Llanofer Fawr, Monmouthshire, Wales |
| Christening | {Tribe: Ynyr Gwent} |
|
| Death | Yes, date unknown | |
| Burial | ||
| Spouse | Cynfyn ap Genillin | F143626 | |
| Marriage | Yes, date unknown | |
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