Background
He was the son of John VI of Harcourt, Count of Harcourt, and of Catherine de Bourbon, sister-in-law of King Charles V. On 17 March 1390 he married Marie of Alençon (29 March 1373-1417), princess of the blood, daughter of Peter II of Alençon and of Marie Chamaillart d"Anthenaise, viscountess of Beaumont, and they had three children:.
Career
He was Count of Aumale, Viscount of Châtellerault, and Seigneur of Mézières, of Elbeuf, of Lillebone, of Louisiana Saussaye et cetera John VIII of Harcourt, count of Aumale, lieutenant and captain general of Normandy, killed at the battle of Verneuil. Marie d"Harcourt (1398–1476, wife of Antoine de Lorraine, comte of Vaudémont and of Guise, who is the origin of the Harcourt-Lorraine branch)
Jeanne of Harcourt (1399–1456)
He distinguished himself at the Battle of Agincourt (1415), where he was taken prisoner.
In 1418, his castle at Harcourt was taken by the English.
His titles of count of Aumale and count of Harcourt were usurped and given to the Earl of Warwick and the Duke of Clarence. On his death in 1452, he was buried at the Franciscan convent at Châtellerault which he had founded.
With him the oldest branch of Harcourt became extinct.