Russian Empire
Though the Empire was only officially proclaimed by Tsar Peter I following the Treaty of Nystad (1721), some historians would argue that it was truly born either when Ivan III of Russia conquered Veliky Novgorod in 1478, or when Ivan the Terrible conquered the Khanate of Kazan in 1552. According to another point of view, the term "Tsardom", which was used after the coronation of Ivan IV in 1547, was already a contemporary Russian word for empire.
History of Russia
After the 13th century, Moscow became a cultural center, and by the 18th century, the Tsardom of Russia had grown to become the Russian Empire, stretching from eastern Poland to the Pacific Ocean. Peasant revolts were common, and all were fiercely suppressed. Russian serfdom was abolished in 1861, but the peasants fared poorly and often turned to revolutionary pressures. In the following decades, reform efforts such as the Stolypin reforms, the constitution of 1906, and the State Duma attempted to open and liberalize the economy and political system, but the tsars refused to relinquish autocratic rule or share their power.