Real name: Васи́лий О́сипович Ключе́вский

Vasily Klyuchevsky (16 [28] January 1841, Voskresenovka, Penza province - 12 [25] May 1911, Moscow) - Russian historian, ordinary professor of Moscow University, honored professor of Moscow University; ordinary academician of the Imperial St. Petersburg Academy of Sciences (over the staff) on Russian history and antiquities (1900), chairman of the Imperial Society of Russian history and antiquities at Moscow University, privy councilor.