House of Valois the senior descendant of Philip IV of France. Charles' character eventually alienated both the French and English monarchs, because he readily switched sides whenever it suited his interest. In 1356, Edward, the Black Prince, eldest son and heir of Edward III, led an army to a chevauchée in France. John pursued the Black Prince, who tried to avoid battling the French king's superior force. Negotiations broke down. In the Battle of Poitiers, the French suffered another humiliating defeat, and their king was captured. Edward hoped to capitalize on the victory by invading France and having himself crowned at Reims. But
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