Dukedoms of the British Isles by reign Dukedoms of the British Isles by reign This page lists extant dukedoms in the Peerages of the British Isles, listed by the monarch who created them—see also List of dukedoms in the peerages of Britain and Ireland. King Edward III first created the title Duke of Cornwall, the first dukedom in the British Isles, for his son and heir Edward, called the Black Prince. Since 1421 the title has automatically been held by the eldest son of and heir apparent to the sovereign. Since his mother's taking the throne in 1952 the title has been held by Prince Charles, who
Edward the Black Prince In order to attach John, Duke of Brabant, to his cause, the king in 1339 proposed a marriage between the young Duke of Cornwall and John's daughter Margaret, and in the spring of 1345 wrote urgently to Pope Clement VI for a dispensation for this marriage. On 12 May 1343, Edward created the duke Prince of Wales, in a parliament held at Westminster, investing him with a circlet, gold ring, and silver rod. The prince accompanied his father to Sluys on 3 July 1345, and Edward tried to persuade the burgomasters of Ghent, Bruges, and Ypres to accept his son