Why is the Duke the Duke of Devonshire instead of the Duke of Derbyshire?
William Cavendish, second son of Elizabeth, Countess of Shrewsbury, was granted the title of Earl of Devonshire in 1618, and the 4th Earl of Devonshire was granted the title of Duke of Devonshire in 1694. The title of Earl of Derby was not available, having been granted to the Stanley family in 1485, so it was simply a matter of granting William Cavendish a vacant title. It is not unusual for there to be little or no connection between a person's title and the area in which his family live. The Earls of Derby owned property in Lancashire and are particularly associated with Liverpool, and the Dukes of Norfolk have their seat at Arundel, in Sussex, and owned extensive property in Sheffield. To complicate the picture, the title of Earl of Devon was subsequently revived in 1831, and this is now held by the Courtenay family whose residence is Powderham Castle, in Devon.