 The Oprichnik

The Oprichnik or The Guardsman (, Oprichnik) is an opera in 4 acts, 5 scenes, by Pyotr Ilyich Tchaikovsky (1840–1893) to his own libretto after the tragedy "The Oprichniks" () by Ivan Lazhechnikov (1792–1869).The subject of the opera is the oprichniks.