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Birth:          16 Aug 1355 Eltham, Kent,  England
Death:          5 Jan 1382 
Burial:         Wigmore, Herefordshire, England

Notes
https://en.wikipedia.org/wiki/Philippa,_5th_Countess_of_Ulster
Philippa of Clarence (16 August 1355 – 5 January 1382) was the suo jure Countess of 
Ulster.
Biography[edit]

She was born at Eltham Palace in Kent on 16 August 1355, the only child of Lionel of 
Antwerp, 1st Duke of Clarence, and Elizabeth de Burgh, 4th Countess of Ulster.[1] Her 
father was the third son, but second son to survive infancy, of King Edward III of 
England and Philippa of Hainault.[2]

Philippa married Edmund Mortimer, 3rd Earl of March, in 1368 at the age of twelve in 
the Queen's Chapel at Reading Abbey,[1] an alliance that would have far-reaching 
consequences in English history. Her cousin, King Richard II remained childless, 
making Philippa and her descendants next in line to the throne until his deposition. In 
the Wars of the Roses the Yorkist claim to the crown was based its descent from 
Edward III through his grand-daughter Philippa of Clarence[3]. Philippa was Anne 
Mortimer's grandmother.

Philippa died in 1378,[4] and was buried at Wigmore Abbey, Herefordshire.

Marriage and issue[edit]

Her children with Edmund Mortimer were as follows:


Name

Birth

Death

Notes

Lady Elizabeth Mortimer 12 February 1371 20 April 1417 She first married Sir Henry 
'Hotspur' Percy, with whom she had two children, Henry Percy, 2nd Earl of 
Northumberland, and Lady Elizabeth Percy. Her second husband was Thomas de 
Camoys, Baron Camoys, with whom she had a son, Lord Roger de Camoys. Elizabeth 
Mortimer was an ancestor of the third Queen Consort of Henry VIII, Jane Seymour. 
Roger Mortimer, 4th Earl of March 11 April 1374 20 July 1398 He married Lady 
Alianore Holland, by whom he had four children, Anne, Edmund, 5th Earl of March, 
Eleanor, and Roger. The House of York's claim to the throne was through his eldest 
daughter, Anne Mortimer. 
Lady Philippa Mortimer 21 November 1375 26 September 1400 She first married John 
Hastings, 3rd Earl of Pembroke. Her second husband was Richard Fitzalan, 11th Earl 
of Arundel, with whom she had a son, John, who died young. Her third husband was 
Sir Thomas Poynings of Basing, 5th Baron St. John. 
Sir Edmund Mortimer 9 November 1376 13 May 1411 Married Catrin (Catherine) 
Glyndwr, the daughter of Owain Glyndwr. They had issue, possibly a son named 
Lionel, said to have died young,[5] and three daughters who died in the Tower of 
London alongside their mother. 

Parents
PLANTAGENET Lionel of Antwerp (29 Nov 1338 - 17 Oct 1368)
DE BURGH Elizabeth (6 Jul 1332 - 10 Dec 1363)

Siblings
PLANTAGENET Philippa (16 Aug 1355 - 5 Jan 1382)

Marriage To DE MORTIMER Edmund "the Good" (1 Feb 1352 - 27 Dec 1381)
    m. 1368 Reading Abbey, Reading, England

Notes

Parents
DE MORTIMER Roger (11 Nov 1328 - 26 Feb 1360)
DE MONTAGU Philippe (ABT 1332 - 5 Jan 1382)

Children by DE MORTIMER Edmund "the Good" 1 Feb 1352 - 27 Dec 1381
MORTIMER Elizabeth (12 Feb 1371 - 20 Apr 1417)

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