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However, it was an attack on Brycheiniog by the Marcher Lords Humphrey de Bohun and Roger Mortimer in 1276 which led to the final breakdown of the peace between England and Wales after which Llywelyn's domain was reduced to just his lands in Gwynedd.
At about this point, Roger Mortimer, 1st Earl of March, received news from Irish sources that an invasion was about to take place, and made his way to Ireland where he held land, mainly in and around the castle and town of Trim.
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.
Sir Edward de Courtenay (c.1385 – 1418), who married, before 20 November 1409, Eleanor Mortimer, second daughter of Roger Mortimer, 4th Earl of March by Eleanor Holland, daughter of Thomas Holland, 2nd Earl of Kent.
While it is often said that Richard II publicly proclaimed Elizabeth Mortimer's brother, Roger Mortimor, as his heir presumptive in Parliament in October 1385, according to Davies the story is without foundation, although contemporary records do indicate that Roger Mortimer's claim to the throne was openly discussed.
Warenne was one of the four earls who captured the two Roger Mortimers, and in 1322 he was one of the nobles who condemned to death the earl of Lancaster.
This gallant behaviour earned him the respect of his captors, including Roger Mortimer, one of the witnesses to his surrender and Hereford and Mortimer both promised to try to intercede on Llywelyn's behalf.
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In October 1326 following the successful rebellion led by Roger Mortimer the Despensers and Edward had further cause to regret their actions in Glamorgan after they were forced to flee there.
Edward II had been deposed and replaced by his son Edward III under the regency of Queen Isabella and Roger Mortimer.
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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In 2002, the actor John Challis, the current owner of the remaining buildings of Wigmore Abbey, invited the BBC programme "House Detectives at Large" to investigate his property.
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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.
In 1359, and continuing into 1360, he was Constable of Edward III's invasion of France, fighting in the failed siege of Reims and capturing Auxerre.
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.
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On 4 September 1397 he was ordered to arrest his uncle, Sir Thomas Mortimer (d. before 14 March 1403) for treason regarding his actions at the Battle of Radcot Bridge, but made no real attempt to do so.
The white hart was evidently derived from the arms of Richard II, who in 1387 declared Roger Mortimer, 4th Earl of March, Edward's maternal great-grandfather, his lawful heir to the crown.
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).
William de Clinton was a boyhood companion of Edward III of England, and as one of the king's followers who secretly entered Nottingham Castle and captured Roger Mortimer, 1st Earl of March.