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
Crown prince holds a title below that of king/queen (such as grand duke or prince), although it is sometimes used as a synonym for heir apparent. In Europe, where primogeniture governed succession to all monarchies except those of the Papacy and Andorra, the eldest son or (more recently) eldest child of the current monarch fills the role of crown prince or princess, depending upon whether females of the dynasty enjoy personal succession rights. Primogeniture has been abolished in Belgium, Denmark, Luxembourg, Norway, Sweden, the Netherlands and the United Kingdom. The eldest living child of a monarch is sometimes not the heir apparent