Edmund Mortimer, 3rd Earl of March
| Edmund Mortimer | |
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3rd Earl of March Earl of Ulster, jure uxoris |
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Arms of Mortimer: Barry or and azure, on a chief of the first two pallets between two base esquires of the second over all an inescutcheon argent
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| Spouse(s) | Philippa Plantagenet |
| Noble family | Mortimer |
| Father | Roger Mortimer, 2nd Earl of March |
| Mother | Philippa Montacute |
| Born | 1 February 1352 |
| Died | 27 December 1381 (aged 29) Cork, Ireland |
Edmund de Mortimer, 3rd Earl of March and jure uxoris Earl of Ulster (1 February 1352 – 27 December 1381) was son of Roger Mortimer, 2nd Earl of March, by his wife Philippa, daughter of William Montagu, 1st Earl of Salisbury and Catherine Grandison.
An infant at the death of his father, 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.
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 on 24 August 1369 at the age of 17 to the 14-year-old Philippa, the only child of the late Lionel of Antwerp, Duke of Clarence, the second son of Edward III.
Lionel's late wife, Elizabeth, had been 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. John of Gaunt, younger brother of Prince Edward, had become the 1st Duke of Lancaster and thus the source of the House of Lancaster's claim to the throne.
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