The title of the Duke of Northumberland is a historic peerage associated with English and British history. Throughout its existence, the title has been formally created on three separate occasions. Two of these creations were established within the Peerage of England, while the third creation was designated within the Peerage of Great Britain.
As of the current era, the title remains active. The present and active holder of this historic peerage is Ralph Percy, who serves as the 12th Duke of Northumberland.
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