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 the Battle of Nájera. However, after a wait of several months, during which he failed to obtain either the province of Biscay or liquidation of the debt from Don Pedro, he returned to Aquitaine. Prince Edward persuaded the estates of Aquitaine to allow him a hearth tax of ten sous for five years in 1368, thereby alienating the lord of Albret and other nobles. Drawn into open war with Charles V of France in 1369, he took Limoges, where in 1370 he gave orders for an indiscriminate massacre in revenge for the voluntary surrender of that town to the French