Ivan IV(redirected from Ivan Vasilyevich)
Also found in: Thesaurus, Encyclopedia.
Related to Ivan Vasilyevich: Ivan the Great
(Biography) known as Ivan the Terrible. 1530–84, grand duke of Muscovy (1533–47) and first tsar of Russia (1547–84). He conquered Kazan (1552), Astrakhan (1556), and Siberia (1581), but was defeated by Poland in the Livonian War (1558–82) after which his rule became increasingly oppressive