The Duke of Hereford is a title in the British peerage, historically associated with the county of Herefordshire. The title was first created in 1397 for Henry Bolingbroke, who later became King Henry IV of England. The title has been held by various members of the royal family and nobility over the centuries. The title is currently not in active use, as it was last held by Henry Fitzalan-Howard, the 15th Duke of Norfolk, who was also known as the Duke of Hereford. The title is part of the broader system of hereditary peerages in the United Kingdom, which includes various ranks such as duke, marquess, earl, viscount, and baron.