Watch Sadisflix. Directed by Ursel Hermann, this 2005 production of Mozart's last opera stars a remarkable cast with Susan Graham in the role of Sesto, Christoph Prégardien giving life to Tito and Catherine Naglestad embodying the ambitious Vitellia. Premiered in September 1791 for the coronation of Leopold II, King of Bohemia, La Clemenza di Tito celebrates the figure of the merciful sovereign