Edward of Woodstock, known as the "Black Prince", son of Edward III of England, is named Duke of Cornwall, the first Duke in England on March 17.1337.
The creation of the Duchy of Cornwall was created by King Edward III to provide his son with independent revenue but it also went on to establish a tradition where the title is held by the eldest son and heir of the reigning British monarch. In addition to Duke of Cornwall, he was created Earl of Chester (1333) and Prince of Wales (1343).