Percy, Hugh Smithson, 1st Duke of Northumberland (1715 -1786)
Hugh Smithson was the only son of Langdale Smithson, of Langdale in Yorkshire, and Philadelphia, daughter of W. Reveley Esq. of Newby in Yorkshire. He succeeded his grandfather, Sir Hugh Smithson, 3rd Baronet in 1729. He was educated at Christ Church, Oxford, where he matriculated 15 October 1730. He was elected a Fellow of the Royal Society in 1736, became High Sheriff of Yorkshire in 1738, and represented Middlesex in Parliament 1740 1750. He married, 10 July 1740, Elizabeth Baroness Percy, only daughter and heir of Algernon Percy, Baron Percy, who succeeded his father as 7th Duke of Somerset in 1748. On 2 October 1749 was created Earl of Northumberland with a special remainder to his son in law. So, on his death in February 1750, he was succeeded in the Dukedom of Somerset by his heir male, in the Barony of Percy by his daughter, and in the Earldom of Northumberland by Hugh Smithson, who took the additional name of Percy. Created Knight of the Garter 18 November 1756, and Lord Lieutenant of Ireland 1763 1765, he was made Duke of Northumberland of the third creation, and Earl Percy, 22 October 1766, and Viscount Lovaine 28 January 1784.