Maria, Duchess of Gloucester and Edinburgh (nΓ©e Walpole; 10 July 1736 β 22 August 1807) was a member of the British royal family. She was the Countess Waldegrave from 1759 to 1766, as a result of her first marriage to James Waldegrave, 2nd Earl Waldegrave. Her second husband was Prince William Henry, Duke of Gloucester and Edinburgh, whom she married in 1766.