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Ivan the Terrible - Wikipedia
Ivan the Terrible | Biography, Accomplishments, & Facts
Ivan the Terrible: Biography, First Tsar of Russia
Ivan IV summary | Britannica
Biography of Ivan the Terrible, First Tsar of Russia - ThoughtCo
Ivan IV, "The Terrible" (Russia) (1530–1584; Ruled 1533–1584)
Russia - Ivan IV, Tsardom, Expansion | Britannica
Ivan Iv | Encyclopedia.com
Ivan IV the Terrible, Tsar of Russia - Oxford Bibliographies
Ivan IV (1530–1584) | Encyclopedia.com