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

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Philippa "of Clarence, 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
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Categories: This Day In History January 05 | This Day In History August 16 | House of Plantagenet.

Note: [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.


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]



  • TAG 275 Vol. 69 No. 3 July 1994
  • Magna Carta Ancestry 2011 2nd ed. Vol. III p. 193-194

badges This person was a member of royalty, nobility or aristocracy in the British Isles. If you are interested in this profile, see our British Isles Royals and Aristocrats 742-1499 Project.
Edited for Jan 2014 Style Standards.
Gedcoms in Changes.


Philippa was born in 1355. Philippa Plantagenet ... She passed away in 1378.

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Images: 1
Pedigree of de Mortimer
Pedigree of de Mortimer


On July 3, 2014 at 19:50GMT Darrell Parker wrote:

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

Philippa is 19 degrees from Kevin Bacon, 23 degrees from AJ Jacobs, 34 degrees from Gene Kelly, 23 degrees from Bram Stoker 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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