What country ruled by the tsars?

Russia was the country ruled by the tsars, who were hereditary monarchs that governed from the 16th century until the early 20th century. The tsarist autocracy, particularly under rulers like Peter the Great and Catherine the Great, expanded Russia's territory and influence. The Romanov dynasty, which began in 1613, ended with the abdication of Tsar Nicholas II in 1917 during the Russian Revolution.