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Philippa (Plantagenet) Mortimer (1355 - abt. 1378)

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Philippa "5th Countess of Ulster" Mortimer formerly Plantagenet
Born in Eltham Palace, Kent, Englandmap
[sibling(s) unknown]
Wife of — married about in Reading Abbey, Queen's Chapel, Reading, Berkshire, Englandmap
Died about in poss. Wigmore Castle, Herefordshiremap
Plantagenet-190 created 21 Feb 2011 | Last modified | Last edit: 23 Jan 2017
17:03: Anonymous (Holland) Carroll edited the Biography for Philippa (Plantagenet) Mortimer. (Adding D. Richardson, RA, source ) [Thank Anonymous for this]
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Categories: This Day In History January 05 | This Day In History August 16 | House of Plantagenet.

European Aristocracy
Philippa (Plantagenet) Mortimer is a member of royalty, nobility or aristocracy in the British Isles.
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Philippa of Clarence, 5th Countess of Ulster

The House of Plantagenet crest. This person is a member of the House of Plantagenet.

Philippa of Clarence was the only child of Lionel of Antwerp and Elizabeth de Burgh [1] She married Edmund Mortimer, 3rd Earl of March (1352-81).

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.[2]


Philippa, 5th Countess of Ulster suo jure.[3]
b. 16 Aug 1355 Eltham Palace, Kent.
d. 05 Jan 1382 Cork, Ireland[4]
bur. Wigmore, Herefordshire.[3]

Early Life

p. Lionel of Antwerp, 1st Duke of Clarence and Elizabeth de Burgh, 4th Countess of Ulster (d.1363).[5]


m. Edmund Mortimer, 3rd Earl of March abt 1368 Reading Abbey[6]


[citation needed] Death date changed June 25, 2015 from "certain, 1378-01-05" to "before, 1381-02-09". Text has death as "d. 05 Jan 1382 Cork, Ireland" (couldn't tell source). Jan. 1382 and Feb 1381 are not incompatible, if both were originally 1381/1382. However, sources for any/all would be nice.


  1. sole heiress of the Anglo-Irish Earl of Ulster and maternal descendant of Henry III (1207-72).
  2. Weir, Alison (1998). "A Race of Magnates." Lancaster and York: The wars of the roses. London: Pimlico. Ebook. ISBN: 9781446449172
  3. 3.0 3.1
    Wikipedia: Philippa, 5th Countess of Ulster
  4. cause: probably fever; After death: rights passed to son, Roger Mortimer, 4th Earl of March.
  5. 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.
  6. 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.
  • "Royal Ancestry" Douglas Richardson, 2013, Vol. I p. 88
  • "Royal Ancestry" Douglas Richardson, 2013, Vol. II p. 24
  • "Royal Ancestry" Douglas Richardson, 2013, Vol. II p. 174
  • TAG 275 Vol. 69 No. 3 July 1994
  • Magna Carta Ancestry 2011 2nd ed. Vol. III p. 193-194

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Images: 1
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 20 degrees from Kevin Bacon, 17 degrees from Abraham Lincoln, 24 degrees from Ayn Rand, 23 degrees from Peter Roberts and 18 degrees from Queen Elizabeth II of the Commonwealth Realms on our single family tree. Login to find your connection.

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