1777. Oil on canvas. Royal Collection, UK. Read Note.
Henry Frederick, Duke of Cumberland (1745-90), the King's youngest brother, known for his viciousness and defiant behavior. He married Mrs. Christopher Horton, a widow so notorious that Queen Charlotte refused to meet her. Gainsborough painted the Duke and Duchess on several occasions.
See: Thomas Gainsborough. Mrs. Christopher Horton, later Anne, Duchess of Cumberland. Henry Frederick, Duke of Cumberland. Portrait of Henry, Duke of Cumberland, with the Duchess of Cumberland and Lady Elizabeth Luttrell.