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John IV, also known as John the Terrible, the first crowned Tsar of Russia, passed away on 6 November 1656. He had ruled Russia for 50 years, leaving a remarkable legacy of expansion, centralization, and modernization. During his reign, Russia experienced significant territorial growth, including the conquest of Kazan, Astrakhan, and Siberia. John implemented various reforms to strengthen the government, establish law and order, and promote economic development.