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 Prince sustained a heavy loss in the death of his friend Chandos. Several efforts were made by Edward to conciliate the Gascon lords, but they were fruitless and can only have served to weaken the prince's authority. It is probable that John of Gaunt was working against him at the English court, and when he was sent out in the summer to help his elder brother, he came with such extensive powers that he almost seemed as though he had come to supersede him. In the spring Charles raised two large armies for the invasion of Aquitaine; one, under the