The oprichnina was a state policy implemented by Tsar Ivan the Terrible in Russia between 1565 and 1572. The policy included mass repression of the boyars, including public executions and confiscation
Oprichniki, by Nikolai Nevrev, shows the mock coronation of Ivan Fyodorov-Chelyadnin (enthroned) accused of conspiracy, before his execution. The man with the knife is Ivan the Terrible himself: according to Alexander Guagnini, Ivan stabbed Fyodorov-Chelyadnin in the heart and the oprichniks finished him off.
"The street in the town": people fleeing at the arrival of the oprichniki, inspired by the opera The Oprichnik by Tchaikovsky, painted by Apollinary Vasnetsov in 1911