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 of Westminster, Prince of Wales race." Edward of Westminster, Prince of Wales Edward of Westminster (13 October 1453 – 4 May 1471), also known as Edward of Lancaster, was the only son of King Henry VI of England and Margaret of Anjou. He was killed at the Battle of Tewkesbury, making him the only heir apparent to the English throne to die in battle. Edward was born at the Palace of Westminster, London, the only son of King Henry VI of England and his wife, Margaret of Anjou. At the time, there was strife between Henry's supporters and those of Richard Plantagenet, 3rd Duke of