EDMUND DE MORTIMER, 3RD EARL OF MARCH, was son of Roger, 2nd Earl of March, by his wife Philippa, daughter of William Montacute, 1st Earl of Salisbury. Being an infant at the death of his father, Edmund, as a ward of the crown, was placed by Edward III under the care of William of Wykeham and Richard Fitzalan, Earl of Arundel.

The position of the young earl, powerful on account of his possessions and hereditary influence in the Welsh marches, was rendered still more important by his marriage in 1368 to Philippa, only daughter of Lionel, Duke of Clarence, third son of Edward III. Lionel's wife was Elizabeth, daughter and heiress of William de Burgh, 6th Lord of Connaught and 3rd Earl of Ulster, and Lionel had himself been created Earl of Ulster before his marriage. The Earl of March, therefore, not only became the representative of one of the chief Anglo-Norman lordships in Ireland in right of his wife Philippa, but the latter, on the death of her father shortly after her marriage, stood next in succession to the crown after the Black Prince and his sickly son Richard, afterwards King Richard II. This marriage had, therefore, far-reaching consequences in the history of England, giving rise to the claim of the house of York to the crown of England, contested in the War of the Roses; Edward IV being descended from the third son of Edward III as great-great-grandson of Philippa, Countess of March, and in the male line from Edmund, Duke of York, fifth son of Edward III.

Mortimer, now styled Earl of March and Ulster, became Marshal of England in 1369, and was employed in various diplomatic missions during the next following years. He was a member of the committee appointed by the Peers to confer with the Commons in 1373 — the first instance of such a joint conference since the institution of representative parliaments — on the question of granting supplies for John of Gaunt's war in France; and in the opposition to Edward III and the court party, which grew in strength towards the end of the reign. March took the popular side, being prominent in the Good Parliament of 1376 among the lords who, encouraged by the Prince of Wales, concerted an attack upon the court party led by John of Gaunt. The Speaker of the Commons in this parliament was March's steward, Peter de la Mare; he firmly withstood John of Gaunt in stating the grievances of the Commons, in supporting the impeachment of several high court officials, and in procuring the banishment of the king's mistress, Alice Perrers.

March was a member of the administrative council appointed by the same parliament after the death of the Black Prince to attend the king and advise him in all public affairs. On the accession of Richard II, a minor, in 1377, the earl became a member of the standing council of government; though as father of the heir-presumptive to the crown he wisely abstained from claiming any actually administrative office. The most powerful person in the realm was, however, John of Gaunt, Duke of Lancaster, whose jealousy of March led to the acceptance by the latter of the lieutenancy of Ireland in 1379. March succeeded in asserting his authority in eastern Ulster, but failed to subdue the O'Neills farther west. Proceeding to Munster to put down the turbulency of the chieftains of the south, March died at Cork on the 27th of December 1381. He was buried in Wigmore Abbey, of which he had been a benefactor, and where his wife Philippa who died about the same time was also interred.

The earl had two sons and two daughters, the elder of whom, Elizabeth, married Henry Percy (Hotspur), son of the Earl of Northumberland. His eldest son Roger succeeded him as 4th earl of March and Ulster. His second son Edmund (1376-1409) played an important part in conjunction with his brother-in-law Hotspur against Owen Glendower; but afterwards joined the latter, whose daughter he married about 1402.

      Excerpted from:

      Encyclopedia Britannica, 11th Ed. Vol XVII.
      Cambridge: Cambridge University Press, 1910. 686.

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Other Local Resources:

• Roger Mortimer, 4th Earl of March
  
• Edmund Mortimer, 5th Earl of March
  
  
• Hundred Years' War
  
• King Edward III
  
• John of Gaunt, Duke of Lancaster
  

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Edmund Mortimer on the Web:

• Genealogy - ThePeerage.com
  
  

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