Duke of Aquitaine House of Valois claimed supremacy over Aquitaine. In 1360, both sides signed the Treaty of Bretigny, in which Edward renounced the French crown but remained sovereign Lord of Aquitaine (rather than merely duke). However, when the treaty was broken in 1369, both these English claims and the war resumed. In 1362, King Edward III, as Lord of Aquitaine, made his eldest son Edward, Prince of Wales, Prince of Aquitaine. In 1390, King Richard II, son of Edward the Black Prince appointed his uncle John of Gaunt Duke of Aquitaine. This grant expired upon the Duke's death, and the dukedom reverted
Edward the Black Prince at La Hogue received knighthood from his father. Then he "made a right good beginning", for he rode through the Cotentin, burning and ravaging as he went, and distinguished himself at the taking of Caen and in the engagement with the force under Sir Godemar du Faÿ, which endeavoured to prevent the English army from crossing the Somme by the ford of Blanquetaque. Early on Saturday, 26 August, before the start of the battle of Crécy, Edward, Prince of Wales received the sacrament with his father at Crécy, and took the command of the right, or van, of the army