Third Rome Ivan IV tsar promulgated Sudebnik of 1550 Zemsky Sobor Kazan Astrakhan Volga Khanate of Sibir Ural Mountains Livonian War Kingdom of Poland Grand Duchy of Lithuania Polish–Lithuanian Commonwealth Kingdom of Sweden Denmark–Norway Crimean Tatars thoroughly defeated Battle of Molodi Lithuania Poland Siberia Tatars Russian
In development of the Third Rome ideas, the grand duke Ivan IV ("the Terrible") was officially crowned the first tsar of Russia in 1547. The tsar promulgated a new code of laws (Sudebnik of 1550), established the first Russian feudal representative body (the Zemsky Sobor), revamped the military, curbed the influence of the clergy, and reorganised local government. During his long reign, Ivan nearly doubled the already large Russian territory by annexing the three Tatar khanates: Kazan and Astrakhan along the Volga, and the Khanate of Sibir in southwestern Siberia. Ultimately, by the end of the 16th century, Russia expanded east of the Ural Mountains. However, the Tsardom was weakened by the long and unsuccessful Livonian War against the coalition of the Kingdom of Poland and the Grand Duchy of Lithuania (later the united Polish–Lithuanian Commonwealth), the Kingdom of Sweden, and Denmark–Norway for access to the Baltic coast and sea trade. In 1572, an invading army of Crimean Tatars were thoroughly defeated in the crucial Battle of Molodi.
