3rd Earl of March and Earl of Ulster Edmund de Mortimer

1351 - 1381  (30 years)

• Name	Edmund de Mortimer  [1]
  Title	3rd Earl of March and Earl of Ulster
  Birth	1351	Isle of Anglesey, Wales   [1]
  Gender	Male
  Death	27 Dec 1381	Cork, Cork, Ireland   [1]
  Burial	Wigmore, Herefordshire, England   [1]
  Person ID	I15159	A Tree Called Smith
  Last Modified	21 Jul 2025

  
  

  Father	2nd Earl of March Roger de Mortimer,   b. 11 Nov 1328, Ludlow, Shropshire, England d. 26 Feb 1360, France (Age 31 years)
  Relationship	natural
  Mother	Philippa Montagu,   b. 1333, England d. 5 Jan 1381, Berkshire, England (Age 48 years)
  Relationship	natural
  Family ID	F5229	Group Sheet  |  Family Chart

  
  

  Family	Philippa Plantagenet,   b. 16 Aug 1355, Elham, Kent, England d. 5 Jan 1381, Cork, Cork, Ireland (Age 25 years)
  Children	1. Elisabeth de Mortimer,   b. 12 Feb 1370, Monmouthshire, Wales d. 20 Apr 1417 (Age 47 years)  [Father: natural]  [Mother: natural]   2. 4th Earl of March and 6th Earl of Ulster Roger de Mortimer,   b. 11 Apr 1374, Monmouthshire, Wales d. 20 Jul 1398, Meath County, Ireland (Age 24 years)  [Father: natural]  [Mother: natural]
  Family ID	F5530	Group Sheet  |  Family Chart
  Last Modified	21 Jul 2025

  
  

• Event Map

  Birth - 1351 - Isle of Anglesey, Wales Death - 27 Dec 1381 - Cork, Cork, Ireland Burial - - Wigmore, Herefordshire, England  = Link to Google Earth

  
  

• Arms Icons & Insignia

  Arms-MORTIMER Mortimer/de Mortimer Coat of Arms

  
  

• Sources

  [S6040] FindAGrave Old World, Edmund Mortimer 1351-1381. Edmund Mortimer, 3rd Earl of March and Earl of Ulster. He was the son of Roger Mortimer,by his wife Philippa, daughter of William Montagu, 1st Earl of Salisbury. He was an infant when his father died. Edmund, as a ward of the crown, was placed by Edward III of England under the care of William of Wykeham and Richard Fitzalan, 10th Earl of Arundel. Edmund's position was powerful on account of his possessions and hereditary influence in the Welsh marches, it became more important by his marriage in 1368 at the age of 17 to the 13 year old Philippa, the only child of Lionel of Antwerp, Duke of Clarence. He was the second son of King Edward III and his wife Philippa of Hainault. Lionel's wife, Elizabeth, was daughter and heiress of William Donn de Burgh, 3rd Earl of Ulster, and Lionel had himself been created Earl of Ulster before his marriage. Edmund inherited the title Earl of Ulster on Lionel's death. Therefore, the Earl of March not only represented one of the chief Anglo-Norman lordships in Ireland in right of his wife Philippa, but Philippa's line was also the second most senior line of descent in the succession to the crown, after Edward, the Black Prince and his son, King Richard II of England. This marriage had far-reaching consequences in English history, ultimately giving rise to the claim of the House of York to the crown of England contested in the Wars of the Roses; Edward IV being descended from the second adult son of Edward III as great-great-grandson of Philippa, countess of March, and in the male line from Edmund of Langley, fourth adult son of Edward III. Edmund's son Roger Mortimer, 4th Earl of March would become heir presumptive to the English crown during the reign of Richard II. Edmund died at Cork on December 27, 1381. He was buried in Wigmore Abbey, of which he had been a benefactor, and where his wife Philippa was also interred. https://www.findagrave.com/memorial/57654426/edmund-mortimer