The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
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 | 10th Baron of Bletso John de Port-St. John (1700-1757)
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 | Barbara de Port-St. John ( -1804) |
| 11th Baron of Bletso John de Port-St. John (1725-1767)  |
| Jane de Port-St. John (1735-1799) |
| Sarah Chase (1735-1775) |
| Ambrose de Port-St. John (1760-1823) |
| John Francis Seymour Fleming de Port-St. John (1761-1832) |
| Thomas de Port-St. John (1765-1827) |
| St. Andrew de Port-St. John (1766-1836) |
| Henry de Port-St. John (1768-1833) |
| Sarah de Port-St. John (1770- ) |
| Mary de Port-St. John (1771- ) |
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