Horatio Walpole (/ˈwɔːlpoʊl/), 4th Earl of Orford (24 September 1717 – 2 March 1797), better known as Horace Walpole, was an English writer, art historian, man of letters, antiquarian, and Whig politician. The youngest son of the first British Prime Minister, Sir Robert Walpole, 1st Earl of Orford, he became the 4th and last Earl of Orford of the second creation on his nephew's death in 1791.