2-548-781 - © Fine Art Images/Heritage Images

'Portrait of Robert Walpole, 1st Earl of Orford', early 18th century. Although the title was never used to refer to him at the time, Walpole (1676-1745) is regarded as Britain's first Prime Minister. His administration lasted from 1721 until he resigned in 1742, longer than that of any Prime Minister since. Found in the collection of the Museum of Private Collections in the A Pushkin Museum of Fine Arts, Moscow.