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Philippa (Plantagenet) Mortimer (1355 - 1382)

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Philippa "5th Countess of Ulster" Mortimer formerly Plantagenet
Born in Eltham Palace, Kent, Englandmap
Ancestors ancestors
[sibling(s) unknown]
Wife of — married about in Reading Abbey, Queen's Chapel, Reading, Berkshire, Englandmap
Descendants descendants
Died in Cork, Irelandmap
Plantagenet-190 created 21 Feb 2011 | Last modified
This page has been accessed 5,063 times.

Categories: House of Plantagenet | This Day In History January 05 | This Day In History August 16.

European Aristocracy
Philippa (Plantagenet) Mortimer is a member of royalty, nobility or aristocracy in the British Isles.
Join: British Isles Royals and Aristocrats 742-1499 Project
The House of Plantagenet crest.
Philippa (Plantagenet) Mortimer is a member of the House of Plantagenet.



Royal Ancestors

Through her father:
William I, "The Conqueror", King of England[1] - 8th great grandfather.
Henry II, King of England[2] - 5th great grandfather.
Philippe IV, King of France [3] - 2nd great grandfather.
Edward I, "Longshanks", King of England[4] - 2nd great grandfather.
Edward III, King of England[5] - Grandfather.

Name and Titles

Philippa of Clarence[6]
Only child of Lionel of Antwerp and Elizabeth de Burgh [7]
Countess of Ulster, suo jure
After her mother died, Philippa became Countess of Ulster in her own right. She is also the person who the House of York based its claim to the throne, in addition to primogeniture.
In fact, the crown should have passed to Lionel's heirs after the failure of the Black Prince’s line ... but it didn't. So it ended being an issue during the Wars of the Roses.[8]


Philippa, 5th Countess of Ulster suo jure.[9]
b. 16 Aug 1355 Eltham Palace, Kent.
d. 05 Jan 1382 Cork, Ireland[10][11]
bur. Wigmore Abbey, Wigmore, Herefordshire.[9]

Early Life

p. Lionel of Antwerp, 1st Duke of Clarence and Elizabeth de Burgh, 4th Countess of Ulster (d.1363).[12]


She married Edmund Mortimer, 3rd Earl of March (1352-81). [13]
m. Edmund Mortimer, 3rd Earl of March abt 1368 Reading Abbey[14]


From Cawley's entry in #MedLands for Edmund Mortimer]: "m (Queen’s Chapel, Reading Abbey before 5 May 1364) PHILIPPA of Clarence, daughter of LIONEL Duke of Clarence & his first wife Elizabeth de Burgh Ctss of Ulster (Eltham Palace, Kent 16 Aug 1355-[21 Nov 1378/9 Feb 1381], bur Cork, Ireland, later transferred to Wigmore, Herefordshire).


  1. Great grandfather of Henry II (
  2. Great grandfather of Edward I (
  3. Maternal grandfather of Edward III of England (
  4. Grandfather of Edward III (
  5. Mahler, Leslie: "Samuel Levis, Quaker Immigrant to Pennsylvania", The Genealogist, Spring 1999, Vol 13, No 1, p. 30-36 (PDF download)
  6. Cawley, Medieval Lands: Philippa of Clarence
  7. sole heiress of the Anglo-Irish Earl of Ulster and maternal descendant of Henry III (1207-72).
  8. Weir, Alison (1998). "A Race of Magnates." Lancaster and York: The wars of the roses. London: Pimlico. Ebook. ISBN: 9781446449172
  9. 9.0 9.1 Wikipedia: Philippa, 5th Countess of Ulster
  10. G. E. Cokayne, The Complete Peerage, new ed., Vicary Gibbs, ed., (London, 1910- 59), 8:445-48, 12 pt. 2:180.
  11. cause: probably fever; After death: rights passed to son, Roger Mortimer, 4th Earl of March.
  12. only child; heiress presumptive to first cousin Richard II; would be displaced in succession by children of the king; Lionel was 2nd surviving son of Edward III and Philippa of Hainault.
  13. Cawley, Medieval Lands: EDMUND III Mortimer
  14. When Richard resigned crown with no issue on 29 Sep 1399, the rightful heir was Edmund Mortimer, 5th Earl of March, whose father Roger died the previous year. The throne was usurped by Richard and Philippa's first cousin, Henry Bolingbroke, which later precipitated the Wars of the Roses. As a result of her seniority in the line of succession to the throne of the Kingdom of England and her marriage into the powerful Mortimer family, her descendants eventually succeeded to the throne as the House of York under Edward IV.
See also:
  • Richardson, Douglas. Royal Ancestry: A Study In Colonial And Medieval Families, in 5 vols. (Salt Lake City, Utah, 2013): vol. I p. 88; vol. II p. 24; vol. II p. 174.
  • Richardson, Douglas. Magna Carta Ancestry: A Study In Colonial And Medieval Families, 2nd ed. in 4 vols, (Salt Lake City, Utah, 2011): vol. III p. 193-194.
  • The American Genealogist [TAG], vol. 69 no. 3 (July 1994): 129-139. The Ancestry of Joan Legard, Grandmother of the Rev. William Skepper/Skipper of Boston, Massachusetts. by James L. Hansen. (paid) LINK
  • Cawley, Charles. Medieval Lands: A Prosopography of Medieval European Noble and Royal Families, Online at Foundation for Medieval Genealogy Website (accessed December 2016).
  • Wikipedia: Philippa, 5th Countess of Ulster
  • Marlyn Lewis

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Pedigree of de Mortimer
Pedigree of de Mortimer


On 3 Jul 2014 at 19:50 GMT Darrell Parker wrote:

Plantagenet-1702 and Plantagenet-190 appear to represent the same person because: same dob, parents, spouse, child, dod

Philippa is 21 degrees from Kevin Bacon, 19 degrees from Joseph Broussard, 19 degrees from Queen Elizabeth II Windsor and 5 degrees from Isabella I de Castilla y León on our single family tree. Login to find your connection.

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