Bygone Russian leader is a term that refers to the former rulers of Russia. The three most common terms used to refer to these leaders are Tzar, TSAR, and CZAR, all of which have 4 letters. Tzar is derived from the Latin word Caesar, TSAR is derived from the Latin word Augustus, and CZAR is derived from the Latin word Caesar. All three terms refer to the same type of leader, who was the absolute monarch of Russia until the Russian Revolution in 1917.