Edward the Black Prince of Cornwall in 1337. He was guardian of the kingdom in his father's absence in 1338, 1340, and 1342. He was created Prince of Wales in 1343 and knighted by his father at La Hogne in 1346. In 1346 Prince Edward commanded the vanguard at the Battle of Crécy, his father intentionally leaving him to win the battle. He took part in Edward III's 1349 Calais expedition. In 1355 he was appointed the king's lieutenant in Gascony, and ordered to lead an army into Aquitaine on a chevauchée, during which he pillaged Avignonet and Castelnaudary, sacked Carcassonne, and plundered Narbonne.
Prince of Wales York. Prior to his father inheriting the English throne in 1603, the future Charles I was created Duke of Albany and Earl of Ross in Scotland. Both Prince Frederick (eldest son of George II) and his son Prince George (later George III) were Duke of Edinburgh. The title Prince of Wales is given only to the heir apparent—somebody who cannot be displaced in the succession to the throne by any future birth. The succession had followed male-preference primogeniture, which meant that the heir apparent was the eldest son of the reigning monarch or, if he was deceased, "his" eldest son