Sir Hugh Smithson, 1st Baronet (c. 1598–1670) of Stanwick St John, North Yorkshire, was a Royalist supporter during the Civil War for which he was rewarded with a baronetcy by King Charles II on the Restoration of the Monarchy in 1660. His great-great-grandson was Sir Hugh Smithson, 4th Baronet (1715-1786), who having inherited by his marriage half of the great Percy, Earl of Northumberland, estates, and the title 2nd Earl of Northumberland by special remainder from his father-in-law Algernon Seymour, 7th Duke of Somerset (d.1750), changed his surname and arms to Percy and was created in 1766 1st Duke of Northumberland.
- ^ Smithson, George R. (June 12, 1906). "Genealogical notes & memoirs of the Smithson family". London : Seeley – via Internet Archive.
- ^ Collins, Arthur, The English Baronetage, vol.3, part 1; Victoria County History, Stanwick St John