Charles J. HalperinCharles J. Halperin is an independent scholar residing in Bloomington, Indiana. He is the author of Russia and the Golden Horde: The Mongol Impact on Medieval Russian History (1985), The Tatar Yoke: The Image of the Mongols in Medieval Russia (1986, 009); Ivan the Terrible: Free to Reward and Free to Punish (2019), Ivan IV and Muscovy (2020), and over 100 articles. Read More Read Less