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'Philippa Plantagenet', (16 August 1355 – 5 January 1382), Countess of Ulster ''suo jure''.
Philippa was born in Eltham Palace, Kent, England on 16 August, 1355. She was the daughter and only child of Lionel of Antwerp, 1st Duke of Clarence and Elizabeth de Burgh, 4th Countess of Ulster. Her father was the second son of King Edward III of England by his Queen consort, Philippa of Hainault.
Philippa married Edmund Mortimer, 3rd Earl of March (1351? – 27 December, 1381) in about 1368, at Reading Abbey an alliance that would have far-reaching consequences in English history. 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.
She died on 5 January, 1382 in Cork, Ireland, and was buried in Wigmore, Herefordshire.

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Marriage and issue

Marriage and issue

She had five children by her marriage to Edmund Mortimer:

Name	Birth	Death	Notes
Lady Elizabeth de Mortimer	12 February 1370/1371	20 April 1417	She married firstly Henry Percy and secondly Thomas Camoys with whom she had a son, Lord Roger de Camoys, and a daughter, Alice, who was in turn, the mother of William Hastings, Baron Hastings.
Roger Mortimer, 4th Earl of March	11 April, 1374	20 July, 1398	The House of York's claim to the throne was through his daughter and heir Anne Mortimer.
Lady Philippa de Mortimer	21 November, 1375	24 September, 1401	She married first John Hastings, 3rd Earl of Pembroke c. 1385, secondly Sir Thomas Poynings of Basing and thirdly Richard Fitzalan, 11th Earl of Arundel.
Sir Edmund Mortimer	9 November, 1376	1409?	Married Catrin (Catherine) Glyndŵr the daughter of Owain Glyndŵr.
Sir John de Mortimer	c. 1378	1424