Duchy of Cornwall from Duchy income, assisted by Grants-in-aid from the Queen. If there is no duke (for example, if the monarch does not have any male children) the duchy income reverts to the monarch and the annual Sovereign Grant is reduced annually by the amount of the duchy's income. The duchy was established on 17 March 1337 by the Royal Great Charter out of the former Earldom of Cornwall by Edward III for his son, Edward, Prince of Wales, the "Black Prince", who became the first Duke of Cornwall. The charter established that the Duke of Cornwall is to be the eldest
Edward the Black Prince (in the Pyrenees) to Pamplona (the capital of Kingdom of Navarre). When Calveley and other English and Gascon leaders of free companies found that the Black Prince was about to fight for Peter, they withdrew from the service of Henry of Trastámara, and joined the Black Prince "because he was their natural lord". While the prince was at Pamplona he received a letter of defiance from Henry. From Pamplona the prince marched by Arruiz to Salvatierra, which opened its gates to his army, and thence advanced to Vitoria, intending to march on Burgos by this direct route. A body of