The academy was founded in 1768 by George III. Its collections and classes were first held in Somerset House (now the site of the Courtauld Institute Galleries), but in 1837 the academy was moved to Trafalgar Square and in 1868 to Burlington House. Its galleries contain works by such former members as Joshua Reynolds (Reynolds, Sir Joshua), Thomas Gainsborough (Gainsborough, Thomas), John Constable (Constable, John), and J.M.W. Turner (Turner, J.M.W.). A particularly notable sculpture is Michelangelo's Taddei tondo, a work in marble depicting the Virgin Mary, Jesus, and John the Baptist. In an annual summer exhibition, the works of contemporary artists are shown. The academy opened a new wing, the Sackler Galleries, in 1991.