control of the Golden Horde, consolidated the whole of Central and Northern Rus' under Moscow's dominion, and was the first to take the title "Grand Duke of all the Russias". After the fall of Constantinople in 1453, Moscow claimed succession to the legacy of the Eastern Roman Empire. Ivan III married Sophia Palaiologina, the niece of the last Byzantine emperor Constantine XI, and made the Byzantine double-headed eagle his own, and eventually Russian, coat-of-arms.
Tsardom of Russia
In development of the Third Rome ideas, the Grand Duke Ivan IV (the "Awesome") was officially crowned the first Tsar ("Caesar") of Russia in 1547. The Tsar promulgated a new code of laws (Sudebnik of 1550), established the first Russian feudal representative body (Zemsky Sobor) and introduced local self-management into the rural regions.
During his long reign, Ivan the Terrible nearly doubled the already large Russian territory by annexing the three Tatar khanates (parts of disintegrated Golden Horde): Kazan and Astrakhan along the Volga River, and Sibirean Khanate in South Western Siberia. Thus by the end of the 16th century Russia was transformed into a multiethnic, multidenominational and transcontinental state.
However, the Tsardom was weakened by the long and unsuccessful Livonian War against the coalition of Poland, Lithuania, and Sweden for access to the Baltic coast and sea trade. At the same time the Tatars of the Crimean Khanate, the only remaining successor to the Golden Horde, continued to raid Southern Russia. In effort to restore the Volga khanates, Crimeans and their Ottoman allies invaded central Russia and were even able to burn down parts of Moscow in 1571. But next year the large invading army was thoroughly defeated by Russians in the Battle of Molodi, forever eliminating the threat of the Ottoman-Crimean expansion into Russia. The raids of Crimeans, however, didn't cease until the late 17th century, though the construction of new
