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 French, who were utterly defeated, left eleven thousand dead on the field, of whom 2,426 were men of gentle birth. Nearly a hundred counts, barons, and bannerets and two thousand men-at-arms, besides many others, were made prisoners, and the king and his youngest son, Philip were among those who were taken. The English losses were not large. When King John II was brought to him, the prince received him with respect, helped him to take off his armour, and entertained him and the greater part of the princes and barons who had been made prisoners at supper. He served at