Please answer a question about the following article about Eton College:

Besides Prince William and Prince Harry, members of the extended British Royal Family who have attended Eton include Prince Richard, Duke of Gloucester and his son Alexander Windsor, Earl of Ulster; Prince Edward, Duke of Kent, his eldest son George Windsor, Earl of St Andrews and grandson Edward Windsor, Lord Downpatrick and his youngest son Lord Nicholas Windsor; Prince Michael of Kent and his son Lord Frederick Windsor; James Ogilvy, son of Princess Alexandra and the Right Honourable Angus Ogilvy, himself an Eton alumnus. Prince William of Gloucester (1942-1972) also attended Eton, as did George Lascelles, 7th Earl of Harewood, son of Princess Mary, Princess Royal.

Which Duke of Gloucester attended Eton?
Prince Richard