The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
 MaleJohn de Port-St. John, of Fonmon |
| Birth | 1219-1228 | |
| Death | ||
| Burial | ||
| Marriage | ||
| Father | William de Port-St. John, Fonmon (heir of Wm ap Hopkin de Cantilupe/Nereberd & Mabel Umfreville) | F4353 Group Sheet | |
| Mother | Isabella Martin | F4353 Group Sheet | |
 FemaleJuliana ferch Ralph Taillard, of Hameldon, Rutland |
| Birth | 1210-1224 | Hambleton, Rutland, England, UK  |
| Death | ||
| Burial | ||
| Father | Ralph Taillard, of Hameldon, Rutland Seneschel for Richard Umfreville | F5738 Group Sheet | |
| Mother | ||
| Male + William de Port-St. John, of Hameldon |
| Birth | bef. 1242 | Hambleton, Rutland, England, UK |
| Death | bef. 8 Aug 1285 | Hambleton, Rutland, England, UK |
| Burial | ||
| Spouse | Sara Wahull de Plumpton, St. John, of Plumpton | F399016 | |
| Marriage | 1242-1256 | |
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