Task: Text Categorization
Input (English): When St. Philip refused to bless him, the former was subsequently martyred by him. He conquered Kazan and Astrakhan, and captured Narva and Dorpat before being scared off by Sigismund II. He confessed the sins of his youth to a Zemski Sobor, established the secret police known as the Oprichnina, and persecuted the boyars as no one ever had. For ten points, name this ruler of Russia from 1533 to 1584, the first to hold the title of tsar.
Output (English): History