The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
1373 - 1422 (50 years) 
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| Name | Alexander de Port-St. John | |
| Suffix | of Barry (1/4th Penmark = Porthkerry) | |
| Birth | abt. 1373 | |
| Gender | Male | |
| Fact | 1417-1422 | Barry, Glamorgan, Wales, UK  |
| Reference: C 1/6/322 Description: Short title: Trenchemere v Seint John. Plaintiffs: Joan, late the wife of Robert Trenchemere. Defendants: Alexander Seint John. Subject: Manor of West Barry: (petition to the duke of Exeter to "speak unto my Lord Chancellor your brother," with pedigree (pedegrew) annexed.): Glamorgan. 2 documents Date: Probably 1404-1407, 1413-1417, or 1424-1426 Held by: The National Archives, Kew Legal status: Public Record(s) Closure status: Open Document, Open Description https://discovery.nationalarchives.gov.uk/details/r/C7437028 | ||
| Death | aft. 1422 | |
| Person ID | I8842 | St. John Origin and Ancestry DNA Database | St. John Generation One - Raoul de Sancto Johanne |
| Last Modified | 14 Dec 2023 | |
| Father | Oliver de Port-St. John, of Fonmon, b. 1324-1333, Basing, Hampshire, England, UK d. aft. 1372, Fonmon Castle (Welsh: Castell Ffwl-y-mwn) , East Aberthaw, Glamorgan, Wales (Age 40 years) | |
| Relationship | Birth | |
| Mother | Elizabeth de la Bere, m. Oliver de Port-St. John of Fonmon, b. 1325-1333, Tolvern, Cornwall, England, UK d. aft. 1372 (Age 40 years) | |
| Relationship | Birth | |
| de Port-St. John Documents |  | Media (Log in) |
| Family ID | F3449 | Group Sheet | Family Chart |
| Family | Margery ferch John St. John, (1/4th of Penmark = West Barrowe) m. Alexander de Port-St. John to hold 1/2 Penmark combined, b. abt. 1375 | |||
| Marriage | abt. 1400 | Glamorgan, Wales, UK |
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| Family ID | F5645 | Group Sheet | Family Chart | ||
| Last Modified | 9 Oct 2023 | |||
 de Port-St. John Documents
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3 de Port-St. John Documents | |
| The St. John Genealogy Newsletter | | Media (Log in) |
| Heraldry | | Media (Log in) |
| Reference | Suzanne St. John. "Alexander de Port-St. John, of Barry (1/4th Penmark = Porthkerry)". The St. John Genealogy Project. https://stjohngenealogy.com/getperson.php?personID=I8842&tree=OSA0001 (accessed April 24, 2025). |
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