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
Chevauchée of the Black Prince (1356) of about 9000 men. The French deduce that the Prince of Wales is preparing to repeat his chevauchée in the autumn of 1355. King John II of France, then at the siege of Breteuil in Normandy, sent reinforcements to reinforce the army of the Dauphin Charles, positioned at Bourges, to support the possessions and cities of Languedoc. Chevauchée of the Black Prince (1356) The Chevauchée of the Black Prince in 1356, which began on 4 August 1356 at Bordeaux and ended with the Battle of Poitiers on 19 September 1356, was a devastating raid of Edward of Woodstock, Prince of