Sir Oliver de Port-St. John, Knight m. Lady Margaret Beauchamp b. Abt 1392 Fonmon Castle (Welsh: Castell Ffwl-y-mwn) , East Aberthaw, Glamorgan, Wales d. 1437: The St. John Genealogy Project

Sir Oliver de Port-St. John, Knight m. Lady Margaret Beauchamp

Abt 1392 - 1437 (45 years)

Submit Photo / Document Has 455 ancestors and 1342 descendants in this family tree.

Name Oliver de Port-St. John

Prefix Sir

Suffix Knight m. Lady Margaret Beauchamp

Fact 1349 Maxey, Northamptonshire, England

Mentioned in Charter
1349 ? Age: 29
Maxey, Northamptonshire, England
http://www.thestewartsinireland.ie/wentworths-fitzwilliam/

Notes (Log in)

Birth Abt 1392 Fonmon Castle (Welsh: Castell Ffwl-y-mwn) , East Aberthaw, Glamorgan, Wales

Notes (Log in)

Gender Male

Alt. Birth 1414 Glamorgan, Wales

Fact 1424

Sir Oliver Saint John was presumably an adult or near adulthood in 1424, when he and his father, John Saint John, Knt., witnessed a confirmation charter of Richard Beauchamp, Earl of Warwick

[Reference: Clark, Cartæ et Alia Munimenta de Glamorgancia 2 (1890): 104-116].

Note: This may have been Oliver St. John, of Penmark Place (Odny's Fee) and NOT Oliver de Port-St. John of Fonmon Castle, Penmark Castle, and Barry Castle.

It is possible the first married another Beauchamp Heiress, Eleanor Beauchamp while this one married Margaret Beauchamp.

Fact 1428 Great Houghton, Northampton, England, UK

https://ia902701.us.archive.org/8/items/inquisitionsasse04grea/inquisitionsasse04grea_bw.pdf page 43

De magistro Sancti Johannis, Norhamtonie, pro tercia parte un. f. in Couesgeave, Pokesley, et Tyffeld de feodo de Keynes - -
ij. 5. iij. tZ. (Nichil, quia privilegiatur, cancelled.)

Oliverus Sentjon, chivaler, Thomas Mortimer pro j. f. m. quod Gruydo Bryan,
custos heredis et omnium terrarum et tenementorum, que fuerunt Roberti de
Panell, tenuit in West Pyrye et Magna Houghton de honore Peverelli
vj.s. viij.fZ.

Census 1429 Fonmon Castle (Welsh: Castell Ffwl-y-mwn) , East Aberthaw, Glamorgan, Wales

Beauchamp's Survey

Notes (Log in)

Ln	Hhold	Given	Surname	Relation	BirthDate	BirthPlace	Age	Gender	Status	Years Married	Children Born	Children Living	Occupation	Immigration Year	Nationality	Religion	Comments
Image																	Transcript
?	Fonmon	Oliveri	St. John	Head				Male					Knight				Oliveri St. John militis duij sae di penmarsk... Lancadill... Lansarinta, Ffonmon... Barry. (Oliver de Port-St. John knight... Penmark...Lancadel...Lansarinta...Fonmon...Barry)

Transcript ID is dbid=9999&iid=d0yw_2
Source Web Site: The St. John Genealogy & DNA

Fact 1429 Fonmon Castle (Welsh: Castell Ffwl-y-mwn) , East Aberthaw, Glamorgan, Wales

Beauchamp's Survey

Residence 14 Jun 1436 Westpery, Northampton, England

14 Henry VI - Part I pg. 487
1436
June 14 Westminster
Oliver Seint John, or Seynt Jon, lord of Westpery, co. Northampton, knight, or of Foumonnue in Wales, knight, for not appearing before the justices of the Bench to answer Henry Gray and Thomas Coke, citizens and drapers of London, citizen and skinner of London, touching a like plea of 36L. London.

Sir Oliver Saint John then styled "lord of Westpery, co. Northampton, knight, or of Foumonnue in Wales, knight," was pardoned for not appearing before the justices of the Bench to answer Henry Gray and Thomas Coke, citizens and drapers of London, touching a plea of debt of £12 16s. 2d. and Richard Denton, citizen and skinner of London, touching a like plea of £36 Reference: Calendar of Patent Rolls, 1429-1436 (1907): 487, which may be viewed at the following weblink:

http://sdrc.lib.uiowa.edu/patentrolls/h6v2/body/Henry6vol2page0487.pdf

Death 1437 [1]

Fact 14 Apr 1438 Northampton, England, UK [2]

OLIVER SEYNT JOHN, KNIGHT
6 Writ. ‡ 14 April 1438. [Kirkeby].
NORTHAMPTONSHIRE. Inquisition [indented]. Northampton. 25 October 1438. [Calcroft].
Jurors: Thomas Watford , Thomas Gerveys , and Nicholas Horncastell , esquires; John Cranesley of West Haddon; Richard Lodyngton of Old (Wold); John Bacon and John Basynges of Easton Neston; William Harughdon and Robert Goldyng of Shutlanger; William Douncote of Towcester; William Wattes of Sywell; and Richard Holwell of Overstone.

He held no lands or tenements in demesne or service of the king or any other.

He died on 4 March last. John Seynt John , his son and next heir, is aged 12 years and more.

C 139/85/6 mm. 1–2

Age at Death 45 years

Association There are 1 associations. Click the left arrow to show them.

Thomas Mortimer, m. Sarah (Relationship: witnessed de magistro Sancti Johanis, Norhamptonie re honour of Peverel)

Person ID I104783383 St. John Origin and Ancestry DNA Database

Last Modified 2 May 2024

	Test Type	Taken by	Haplogroup	Test Information
DNA Tests	3 DNA tests are associated with Sir Oliver de Port-St. John, Knight m. Lady Margaret Beauchamp
	Y-DNA-37	Private	I-M253	Most distant ancestor: Hughues Gospatric de Port, b. 980, Cil de Port, Calvados, Normandy, France d. 1056, Cil de Port, Calvados, Normandy, France Most recent common ancestor: Sir Oliver de Port-St. John, Knight m. Lady Margaret Beauchamp, b. Abt 1392, Fonmon Castle (Welsh: Castell Ffwl-y-mwn) , East Aberthaw, Glamorgan, Wales d. 1437
	Y-DNA-111	Private	I-M253	Most distant ancestor: Hughues Gospatric de Port, b. 980, Cil de Port, Calvados, Normandy, France d. 1056, Cil de Port, Calvados, Normandy, France Most recent common ancestor: Sir Oliver de Port-St. John, Knight m. Lady Margaret Beauchamp, b. Abt 1392, Fonmon Castle (Welsh: Castell Ffwl-y-mwn) , East Aberthaw, Glamorgan, Wales d. 1437 111 Marker values: 13,23,14,9,14-14,11,14,11,12,11,29,15,8-9,8,11,23,16,20,29,12-14-15-16,10,10,19-21,14,13,15,21,35-37,12,10,11,8,15-15,8,11,10,8,9,10,12,23-25,15,10,12,12,14,8,13,25,19,12,13,11,12,11,11,12,11,29,12,8,17,12,24,27,19,11,12,12,13,12,9,11,11,10,12,13,31,11,12,21,16,11,10,29,15,18,11,24,17,13,15,25,12,23,18,12,15,18,9,12,11
	Y-DNA-111	Private	I-M253	Most distant ancestor: Hughues Gospatric de Port, b. 980, Cil de Port, Calvados, Normandy, France d. 1056, Cil de Port, Calvados, Normandy, France Most recent common ancestor: Hughues Gospatric de Port, b. 980, Cil de Port, Calvados, Normandy, France d. 1056, Cil de Port, Calvados, Normandy, France 111 Marker values: 13,23,14,9,14-14,11,14,11,12,11,29,15,8-9,8,11,23,16,20,29,12-14-15-16,10,10,19-21,14,13,15,21,35-38,11,10,11,8,15-15,8,11,10,8,9,10,12,23-25,15,10,12,12,14,8,13,26,19,12,13,11,12,11,11,12,11,29,12,8,17,12,24,27,19,11,12,12,13,11,9,11,11,10,12,13,31,11,12,21,16,11,10,22,15,18,11,24,17,13,15,25,12,22,18,12,14,18,9,12,11

Father	Sir John de Port-St. John, Knight, of Fonmon, b. bef. 20 Nov 1371, Fonmon Castle (Welsh: Castell Ffwl-y-mwn) , East Aberthaw, Glamorgan, Wales d. 26 Dec 1424 (Age 53 years)
Relationship	Birth
Mother	Isabella Paulet, of Barry Castle; m. John Paveley Jr., m.2 John de Port-St. John;, b. 1373
Relationship	Birth
Marriage	May 2 1391	England, UK [3, 4]
	Notes (Log in)
Age at Marriage	He : 19 years and 3 months - She : ~ 18 years and 2 months.
de Port-St. John Documents		Media (Log in)
de Port-St. John Marriage		Media (Log in)
Family ID	F4420	Group Sheet \| Family Chart

Family Lady Margaret Beauchamp, of Bletso, Bedfordshire, Oxfordshire, and Lydiard Tregoze, Wiltshire, b. 1 Jan 1405, England, UK d. 8 Aug 1482, England, UK (Age 77 years)

Marriage 1425 England, UK

Age at Marriage He : ~ 33 years - She : ~ 19 years and 11 months.

Children

+	1. John de Port-St. John, Esq. of Bletso, b. 1425, England, UK d. 17 Aug 1488, England, UK (Age 63 years) [Father: Birth] [Mother: Birth]
	2. Elizabeth de Port-St. John, Zouche, Scrope, b. bef. 1427, England, UK d. 1468 (Age 41 years) [Father: Birth] [Mother: Birth]
+	3. Oliver de Port-St. John, Esquire of Lydiard Tregoze, b. bef. 1429 d. 3 Apr 1497, Fonterabia, Spain (Age 68 years) [Father: Birth] [Mother: Birth]
	4. Margaret de Port-St. John, m. Sir Richard Throgmorton, Knight, b. bef. 1431 d. 1492 (Age 61 years) [Father: Birth] [Mother: Birth]
	5. Agnes de Port-St. John, Malpas, b. bef. 1433 [Father: Birth] [Mother: Birth]
	6. Mary de Port-St. John, Tregonnell, b. bef. 1435 [Father: Birth] [Mother: Birth]
+	7. Edith de Port-St. John, Poole, b. bef. 1437 [Father: Birth] [Mother: Birth]

de Port-St. John Documents Media (Log in)

Family ID F3719 Group Sheet | Family Chart

Last Modified 20 Dec 2023

Pedigree

1Sir Oliver de Port-St. John, Knight m. Lady Margaret Beauchamp(Abt 1392 – 1437)	2Sir John de Port-St. John, Knight, of Fonmon(1371 – 1424)	4Oliver de Port-St. John, of Fonmon(1324-1333 – 1372)	8John de Port-St. John, of Boketon, Northampton(1275 – 1333)
			9Alice Wallis, St. John, de Paveley(1289 – 1346)
		5Elizabeth de la Bere, m. Oliver de Port-St. John of Fonmon(1325-1333 – 1372)	10John de la Bere(1316 – 1362-1371)
			11Isabel Moulton, m.1) John de la Bere of Tolvern m2) John Arundel(1315 – 1371)
	3Isabella Paulet, of Barry Castle; m. John Paveley Jr., m.2 John de Port-St. John;(1373 – )	6Sir John Paulet, m. Constance de Poynings(1350 – )	12William Paulet, m. Eleanor de la Mare(1330 – )
			13Eleanor de la Mare, Paulet(1330 – 1413)
		7Constance de Poynings, m. John Paulet(1350 – )	141st Baron Poynings of Basing Luke de Poynings(1322 – 1376)
			15Isabel de Port-St. John, 4th Baroness St. John; de Poynings; Lady St. John(1333 – 1393)

de Port-St. John Documents Media (Log in)

Debunked Claims » Slide Show	2 Debunked Claims
	Media (Log in)
	Debunking the de Port-St. John Pedigree according to the Triptych at St. Mary’s Church, Lydiard Tregoze, Wiltshire, England, UK

Sources Media (Log in)

The St. John Genealogy Newsletter Media (Log in)

Notes Notes (Log in)

Reference Suzanne St. John. "Sir Oliver de Port-St. John, Knight m. Lady Margaret Beauchamp". The St. John Genealogy Project. https://stjohngenealogy.com/getperson.php?personID=I104783383&tree=OSA0001 (accessed May 12, 2025).

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