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 demolishing a large piece of wall which filled the ditches with its ruins. The town was then stormed, with the inevitable destruction and loss of life. The Victorian historian, William Hunt and author of the Black Prince's biography in the "Dictionary of National Biography" (1889) relying on Froissart as a source wrote that when the bishop (who was the most responsible for the surrender) was brought before the Prince, the Prince told him that his head should be cut off (Lancaster persuaded him not to carry out the deed), but that the city was never the less pillaged and