Alexander II becomes Tsar of Russia.

Alexander II was Emperor of Russia, King of Poland and Grand Duke of Finland from 2 March 1855 until his assassination in 1881. Alexander's most significant reform as emperor was the emancipation of Russia's serfs in 1861, for which he is known as Alexander the Liberator.

Tsar is a title historically used by Slavic monarchs. The term is derived from the Latin word caesar, which was intended to mean emperor in the European medieval sense of the term—a ruler with the same rank as a Roman emperor, holding it by the approval of another emperor or a supreme ecclesiastical official—but was usually considered by Western Europeans to be equivalent to "king".