The Duke of Northumberland is a title in the British peerage, associated with the historic region of Northumberland in England. The title has been held by the Percy family since the 14th century, making it one of the oldest noble titles in the country. The current Duke, as of 2023, is Ralph Percy, who succeeded his father in 1995. The Duke's family seat is Alnwick Castle, a significant historical landmark that has been featured in various films and television series, including the Harry Potter franchise. The Duke also plays a role in local and national affairs, often engaging in charitable activities and heritage preservation.