He fought at Agincourt, and was killed in a sea battle in Henry V's continuing campaigns in Normandy.

[citation needed] Born about 1385,[1] 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[2] of Gressenhall, Norfolk by his second wife, Elizabeth le Latimer, the daughter of William le Latimer, 3rd Lord Latimer.

She was sister of Edmund Mortimer, 5th Earl of March,[7] 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,[8] 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.

[citation needed] Henry V's campaign in France began with sea battles along the Normandy coast, and Courtenay attacked the entrance to the Seine.

Henry V's continuing campaigns in France required reliable sea captains, and Courtenay was appointed Admiral of the Fleet[14] briefly from May to August 1418.