Chivalry and Betrayal: The Hundred Years' War
In 1435 Bedford died and sworn enemies Charles VII and Phillip, Duke of Burgundy joined forces to get the English out and with Henry VI reluctance to wage war and to maintain peace by marrying Margaret of Anjou. Charles had no intention of peace and used cannon and sieges to retake France and Normandy culminating in the defeat of the English at the Battle of Castillon in the last English territory of Gascony ending the hundred years war.
Duchy of Aquitaine
Having suppressed a revolt in his new possession, Henry gave it to his son Richard. When Richard died in 1199, it reverted to Eleanor, and on her death five years later, it was absorbed into the English crown and henceforward followed the fortunes of the other English possessions in France, such as Normandy and Anjou, ultimately leading to the Hundred Years' War between the French and English crowns.