The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
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 | Sir Robert de Port-St. John, of Basing (1190-1267)
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 | Agnes de Cantilupe, of Lordship of Lancarfan m. Robert de Port-St. John; m2. John Turberville (1190-1289)
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| William de Port-St. John, Fonmon (heir of Wm ap Hopkin de Cantilupe/Nereberd & Mabel Umfreville) (1208-1296)  |
| Lord of East Aberthaw Philip de Port-St. John (1232-1306) |
| Reginald fitzPiers (1190-1286)
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| Alice Stanford, m. Reginald fitzPiers (1215-1265)
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| Alice fitz Piers (1232-1306)
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| Amadeus de Port-St. John (1262-1301) |
| Edward de Port-St. John (1264-1301) |
| Roger de Port-St. John (1266-1314) |
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