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.
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Following the end of the Good Parliament its acts were reversed by John of Gaunt, March's steward was jailed, and March himself was ordered to inspect Calais and other remote royal castles as part of his duty as Marshall of England.
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The most powerful person in the realm was, however, the king's uncle John of Gaunt, whose jealousy of March led to the acceptance by the latter of the office of Lord Lieutenant of Ireland in 1379.
# Edmund Mortimer (b. 1376), brother of Roger and great-grandson of Edward III
Before becoming speaker, he worked variously as a toll collector, High Sheriff of Herefordshire in 1374, and as a steward to Edmund Mortimer, 3rd Earl of March.
In 1382, Richard granted him the office of under-chamberlain of the King's household for life, and appointed him surveyor of the lands in South Wales in the King's hands during the minority of the heir of Edmund Mortimer.
The castle was the subject of extensive works in the late 13th or early 14th century, when it was held by Roger Mortimer (1231-1282), Edmund Mortimer (1282-1304) and Roger Mortimer, 1st Earl of March (lived 1287-1330).
The arms are Courtenay impaling the arms of his wife's father as Duke of York: Quarterly 1st: Royal arms of Lionel, Duke of Clarence; second and third, Elizabeth de Burgh, 4th Countess of Ulster; fourth, Edmund Mortimer, 3rd Earl of March.
Edmund Burke | Edmund Spenser | Edmund Hillary | Robert Harley, 1st Earl of Oxford and Earl Mortimer | Edmund Wilson | Edmund Husserl | Mortimer Wheeler | Edward Harley, 2nd Earl of Oxford and Earl Mortimer | Edmund Muskie | Edmund Allenby, 1st Viscount Allenby | Mortimer | Edmund Barton | John Mortimer | Edmund the Martyr | Edmund Rubbra | Edmund Kirby Smith | Edmund Gosse | SS Edmund Fitzgerald | George Edmund Street | Edmund Kean | Edmund Francis Law | Edmund Campion | St Edmund Hall, Oxford | Roger Mortimer | Edmund Sharpe | Edmund Blunden | Edmund | The Wreck of the Edmund Fitzgerald | SS ''Edmund Fitzgerald'' | Edmund White |
Mortimer, grandson of Roger Mortimer, 1st Baron Mortimer and Maud de Braose, Baroness Mortimer, was born at Wigmore Castle, Herefordshire, England, the firstborn of Marcher Lord Edmund Mortimer, 2nd Baron Mortimer, and Margaret de Fiennes.
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Through his son Sir Edmund Mortimer, he is an ancestor of the last Plantagenet monarchs of England from King Edward IV to Richard III.
He had a younger brother, Edmund Mortimer, and two sisters, Elizabeth, who married Henry 'Hotspur' Percy, and Philippa (1375-1401), who married firstly John Hastings, 3rd Earl of Pembroke (d.1389), killed in a tournament at Woodstock Palace, secondly Richard de Arundel, 11th Earl of Arundel (1346-1397), beheaded in 1397, and thirdly, Sir Thomas Poynings.