Tsar (also spelled czar, tzar, szar, ssar or csar) is a title used to designate certain monarchs or supreme rulers.It is is a Slavic term which is derived from Caesar – – -. In the European medieval sense of the term,he is a ruler who claims the same rank as a Roman emperor, with the approval of another, greater emperor or a supreme ecclesiastical official. The last official use of the title and position of czar was in Bulgaria as WWII ended (1946).