Overview
Sir Edward Courtenay (c.1385 – c. August 1418) was the eldest son of Edward de Courtenay, 11th Earl of Devon (d. 5 December 1419). He fought at Agincourt, and was killed in a sea battle in Henry V's continuing campaigns in Normandy.
Family
Born about 1385, Sir Edward Courtenay was the eldest son and heir of Edward Courtenay, 11th Earl of Devon (d. 5 December 1419), and Maud Camoys, the daughter of Sir John de Camoys of Gressenhall, Norfolk by his second wife, Elizabeth le Latimer, the daughter of William le Latimer, 3rd Lord Latimer. Courtenay had two younger brothers, Hugh Courtenay, 12th Earl of Devon, and James Courtenay, and a sister, Elizabeth Courtenay, who had issue by her first marriage to John Harington, 4th Baron Harington (d. 11 February 1418), and no issue by her second marriage to William Bonville, 1st Baron Bonville (d. 18 February 1461).
Before 20 November 1409 Courtenay married Eleanor Mortimer, daughter of Roger de Mortimer, 4th Earl of March, and Eleanor Holland. Courtenay's sister-in-law, Anne Mortimer, was born at New Forest, Westmeath, one of the Mortimer estates in Ireland, and it is likely Eleanor Mortimer was born there as well. She was sister of Edmund Mortimer, 5th Earl of March, Because King Richard II of England had no issue, Eleanor's father, Roger Mortimer, 4th Earl of March, as maternal grandson of Richard's brother Lionel of Antwerp, 1st Duke of Clarence, was heir presumptive during his lifetime, and at his death in Ireland on 20 July 1398 his claim to the crown passed to his eldest son, Eleanor's brother Edmund Mortimer, 5th Earl of March.
On 30 September 1399, the fortunes of Eleanor Mortimer and her brothers and sister changed entirely. Richard II was deposed by the Lancastrians led by Henry Bolingbroke, who became King Henry IV and had his own son, the future King Henry V, recognized as heir apparent at his first Parliament. Eleanor's brothers, Edmund and Roger, were kept in custody by the new King at Windsor and Berkhampstead castles, but were treated honourably, and for part of the time brought up with the King's own children, John and Philippa.
From Wikipedia (CC BY-SA 4.0).