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
Prince of Wales York. Prior to his father inheriting the English throne in 1603, the future Charles I was created Duke of Albany and Earl of Ross in Scotland. Both Prince Frederick (eldest son of George II) and his son Prince George (later George III) were Duke of Edinburgh. The title Prince of Wales is given only to the heir apparent—somebody who cannot be displaced in the succession to the throne by any future birth. The succession had followed male-preference primogeniture, which meant that the heir apparent was the eldest son of the reigning monarch or, if he was deceased, "his" eldest son