The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
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 MaleWilliam de Port-St. John, Fonmon (heir of Wm ap Hopkin de Cantilupe/Nereberd & Mabel Umfreville) |
| Birth | 1194-1208 | |
| Death | 1290-1296 | |
| Burial | ||
| Marriage | 1232 | Sussex, England,UK  |
| Father | Sir Robert de Port-St. John, of Basing | F4429 Group Sheet | |
| Mother | Agnes de Cantilupe, of Lordship of Lancarfan m. Robert de Port-St. John; m2. John Turberville | F4429 Group Sheet | |
 FemaleIsabella Martin |
| Birth | 1194-1208 | |
| Death | ||
| Burial | ||
| Father | William Martin, Lord Martin | F5754 Group Sheet | |
| Mother | Eleanor fitzPiers, m. William Martin, Lord Martin | F5754 Group Sheet | |
| Male + Henry de Port-St. John, of Broughton, Northampton & Fonmon, Glamorgan |
| Birth | abt. 1250 | Basing, Hampshire, England, UK |
| Death | aft. 1312 | Fonmon Castle (Welsh: Castell Ffwl-y-mwn) , East Aberthaw, Glamorgan, Wales |
| Burial | ||
| Spouse | Isabella de Derby | F6006 | |
| Marriage | ||
| Male + John de Port-St. John, of Fonmon |
| Birth | 1219-1228 | |
| Death | ||
| Burial | ||
| Spouse | Juliana ferch Ralph Taillard, of Hameldon, Rutland | F5997 | |
| Marriage | ||
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