Desc: George III: The Genius of the Mad King: Directed by John Bridcut. With Robert Hardman, Simon Callow, Sian Thomas, Jim Ambuske. After 200 years under lock and key, all the personal papers of one of our most important monarchs are seeing the light of day for the first time. In the first documentary to gain extensive access to the Royal Archives, Robert Hardman sheds fascinating new light on George III, Britain's longest-reigning king.