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 handed over to him. In order to get rid of his creditor Peter told him that he could not get money at Burgos, and persuaded the prince to take up his quarters at Valladolid while he went to Seville, whence he declared he would send the money he owed. The Black Prince remained at Valladolid during some very hot weather, waiting in vain for his money. His army suffered so terribly from dysentery and other diseases that it is said that scarcely one Englishman out of five ever saw England again. He was himself seized with a sickness from which