Isabel (Marshal) of Cornwall
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Isabel (Marshal) of Cornwall (1200 - 1240)

Isabel "Countess of Glouster and Hertford, Cornwall and Poitou" of Cornwall formerly Marshal aka de Clare
Born in Pembroke Castle, Pembrokeshire, Walesmap
Ancestors ancestors
Wife of — married 9 Oct 1217 [location unknown]
Wife of — married 30 Mar 1231 in , Fawley, Buckinghamshire, Englandmap
Descendants descendants
Died in Berkhampstead Castle, Hertfordshire, Englandmap
Profile last modified | Created 22 Sep 2013 | Last significant change: 29 Jun 2020
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British Aristocracy
Isabel (Marshal) of Cornwall was a member of aristocracy in the British Isles.
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Disambiguation: Isabel, the daughter of Willliam Marshal and Isabel de Clare, had an elder sister named Sybil, and her grandmother (William's mother) was also Sybil or Sybilla Marshal. Isabel the wife of Gilbert de Clare was not named Sybilla.



A medieval English countess, she was the wife of both Gilbert de Clare, 4th Earl of Hertford and 1st Earl of Gloucester and Richard, 1st Earl of Cornwall (son of King John of England). With the former,she was a great grandparent of King Robert the Bruce of Scotland. [1]
Born at Pembroke Castle, Pembrokeshire, Wales, on 9 Oct 1200, she married Sir Gilbert de Clare, Earl of Gloucester and Hertford, on her birthday, 9 Oct 1217. [2] Isabel was the seventh child, and second daughter, of William Marshal, 1st Earl of Pembroke and Isabel de Clare. She had five brothers: the 2nd, 3rd, 4th, 5th and 6th Earl's of Pembroke; each of her brothers dying without a legitimate male heir and passing it on to the next brother in line. Her last brother to hold the title of Earl of Pembroke died without legitimate issue. Isabel had four sister, and the title was passed down through the family of Isabel's younger sister Joan. Her sisters married, respectively, the Earls of Norfolk, Surrey, and Derby; the 10th Baron Abergavenny and the Lord of Swanscombe. [1]
She had proven child bearing ability and the ability to bear healthy sons; as evidenced by her six young children, three of whom were sons. These were most likely the reasons for both the proposal of marriage from Richard, 1st Earl of Cornwall, and Isabel's acceptance of it, despite the fact that her husband had just died five months previously. The two were married on 30 March 1231 at Fawley Church, much to the displeasure of Richard's brother King Henry, who had been arranging a more advantageous match for Richard. Isabel and Richard got along well enough, though Richard had a reputation as a womanizer and is known to have had mistresses during the marriage. They were the parents of four children, three of whom died in the cradle.[1]
Isabel died of liver failure, contracted while in childbirth, on 17 January 1239/40, at Berkhamsted Castle, Hertfordshire, England. [3] She was 39 years old. [3]
When Isabel was dying she asked to be buried next to her first husband at Tewkesbury Abbey, but Richard had her interred at Beaulieu Abbey, with her infant son, instead. [3] As a pious gesture, however, he sent her heart, in a silver-gilt casket, to Tewkesbury. [1]


Husband: Gilbert de Clare
Wife: Isabel Marshal
Child: Maud de CLARE
Child: Joan de CLARE
Child: Susan de CLARE
Child: Amica de CLARE
Child: Richard de CLARE
Child: Isabel CLARE
Child: Adeliza CLARE
Child: William CLARE
Child: Agnes CLARE
Child: Gilbert CLARE
Marriage: 09 OCT 1217, England[4]
Husband: Richard Plantagenet
Wife: Isabel Marshal
Marriage: 30 MAR 1231, Fawley, Buckinghamshire, England [5]
Husband: William Marshal
Wife: Isabel Fitzgilbert de CLARE
Child: Sibyl Marshal
Child: Isabel Marshal
Child: Maud (Matilda) Marshal
Child: Eve Marshal
Child: Gilbert Marshal
Child: William Marshal
Child: Richard Marshal
Child: Joane Marshal
Child: Anselm Marshal
Child: Walter Marshal
Marriage: AUG 1189, London, Middlesex, England [6] [7]


Name: Isabel Marshall [8][9] [10][11] [12] [13] [14] [15]
Name: Isabel Countess of Gloucester and Hereford, Cornwall and Pictou [16]


Birth: 9 OCT 1200, Pembrokeshire, Wales [2] [17]


Burial: ABT 1240, Beaulieu Abbey, Beaulieu, Hampshire, England [18]

Douglas Richardson in Royal Ancestry provides the following for the death and burial of Isabel Marshal: She died testate at Berkhampstead, Hertfordshire in childbed of jaundice 17 Jan. 1239/40. Her body was buried at Beaulieu Abbey, Hampshire, her bowels went to Missenden (Great Missenden Abbey in Buckinghamshire), and her heart was sent to Tewkesbury Abbey for burial in her first husband's grave. Tewkesbury Abbey information also provided to Alton Rogers in October 2006 by Tewkesbury Abbey Hon. Archivist Mr. G. F. Strawford about burials in the Abbey.

No more info is currently available. Can you add to this biography?


  • Royal Ancestry 2013 D. Richardson Vol. II p. 184-191
  1. 1.0 1.1 1.2 1.3 The Magna Charta Sureties 1215
  2. 2.0 2.1 Royal Ancestry: A Study in Colonial and Medieval Families, vol II, page 185
  3. 3.0 3.1 3.2 Royal Ancestry: A Study in Colonial and Medieval Families, vol II, page 186
  4. Source: #S37 Page: 28
  5. Medieval Lands
  6. Medieval Lands
  7. Source: #S00082
  8. Source: #S004330 Birth date: 9 Oct 1200 Birth place: Pembroke Castle, Wales Death date: 17 Jan 1240 Death place: Berkhampstead Castle, Hertfordshire, England
  9. Source: #S004444 Ancestry Family Trees
  10. Source: #S2
  11. Source: #S3
  12. Source: #S5
  13. Source: #S37 page 145
  14. Ancestry Family Trees Source: #S499
  15. Medieval Lands
  16. Medieval Lands
  17. Source: #S37 Page: 145
  18. Medieval Lands
  • Cawley, Charles. Entry for 8. Isabel (database online). "Medieval Lands": A prosopography of medieval European noble and royal families © by Charles Cawley, hosted by Foundation for Medieval Genealogy (FMG). See also WikiTree's source page for MedLands.
  • Richardson, Douglas. Royal Ancestry: A Study in Colonial and Medieval Families, 5 vols, ed. Kimball G. Everingham. Salt Lake City: the author, 2013; volume II, page 298 #6 and page 185-186, 298. See also WikiTree's source page for Royal Ancestry.
  • Richardson, Douglas. Magna Carta Ancestry: A Study in Colonial and Medieval Families, 4 vols, ed. Kimball G. Everingham. 2nd edition. Salt Lake City: the author, 2011; volume I pages 451-460. See also WikiTree's source page for Magna Carta Ancestry.
  • The Magna Charta Sureties 1215, Frederick Lewis Weis, additions by Walter Lee Sheppard Jr, (5th Edition, 1999), Page: 28-2, 41-2, 145-2, 153-5
  • Source: #S-37 The Magna Charta Sureties, 1215, Edition: 4th ed., Weis, Frederick Lewis (Baltimore, Maryland, Genealogical Publishing Co., Inc., 1991)
See also:
  • Source: #S-00082 Isabel Marshal, database online, Wikipedia, Creative Commons Attribution-ShareAlike License.
  • Source: #S-2 Pedigree Resource File CD 49 Publication: (Salt Lake City, Utah: Intellectual Reserve, Inc., 2002
  • Source: #S-3 Ancestral File (TM) The Church of Jesus Christ of Latter-day SAINTS Publication: June 1998 (c). : Ancestral File Number: 8WKK-WV; 8XJ66P
  • Source #S-5 Ancestry Family Trees, Online publication, (Provo, UT, USA: The Generations Network). Original data: Family Tree files submitted by Ancestry members.
  • Source: #S-004330 Millennium File, Heritage Consulting, online publication - (Provo, UT, USA: The Generations Network, Inc., 2003). Original data - Heritage Consulting. The Millennium File. Salt Lake City, Utah, USA Repository:
  • Source: #S-004444 Ancestry Family Trees Online publication, Provo, UT, USA: Original data: Family Tree files submitted by Ancestry members.

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Biography, second and third line. "With the former, (space) she was a Great Grandparent (capitalize)." Second paragraph, line six. "Isabel had four sister(s)."
posted by Eileen Bradley
The correct spelling of the family name is Marshal as in Norman French: Williame le Mareschal :)
posted by Wendy (Smith) Hampton

Isabel is 26 degrees from Mary McCauley, 28 degrees from B. W. J. Molier and 10 degrees from Henry VIII of England on our single family tree. Login to find your connection.

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