Alexander II., emperor of Russia, son and successor of Nicholas I., fell heir to the throne while the siege of Sebastopol was going on; on the conclusion of a peace applied himself to reforms in the state and the consolidation and extension of the empire. His reign is distinguished by a ukase decreeing in 1861 the emancipation of the serfs numbering 23 millions, by the extension of the empire in the Caucasus and Central Asia, and by the war with Turkey in the interest of the Slavs in 1877-78, which was ended by the peace of San Stephano, revised by the treaty of Berlin. His later years were clouded with great anxiety, owing to the spread of Nihilism, and he was killed by a bomb thrown at him by a Nihilist (1818‒1881).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Alexander I. * Alexander III.