van the Terrible, Russian Ivan Grozny, byname of Ivan Vasilyevich, also called Ivan IV, (born August 25, 1530, Kolomenskoye, near Moscow [Russia]—died March 18, 1584, Moscow), grand prince of Moscow (1533–84) and the first to be proclaimed tsar of Russia (from 1547). His reign saw the completion of the construction of a centrally administered Russian state and the creation of an empire that included non-Slav states. Ivan engaged in prolonged and largely unsuccessful wars against Sweden and Poland, and, in seeking to impose military discipline and a centralized administration, he instituted a reign of terror against the hereditary nobility.
https://www.britannica.com/biography/Ivan-the-Terrible