The 3rd Duke (1698-1755) served for seven years as Lord Lieutenant of Ireland and was Member of Parliament from 1721 till his fathers death sent him to the House of Lords in 1729. Sir Robert Walpole, the Prime Minister, was a friend of his and his father, and the two Van Dyck portraits of Arthur Goodwin and Jeanne de Blois, which hang in the Great Dining Room, came from Walpoles collection. When Devonshire House in Piccadilly was burnt down in 1733, the 3rd Duke commissioned William Kent to rebuild it. Kent designed furniture for it, much of which is now at Chatsworth.