What is Tsar?
'''Tsar''' is a title for the supreme [[ruler]] in several countries. In [[Bulgaria]], the title was used in 913–1422 and again in 1908–1946. The last tsar to rule [[Kingdom of Bulgaria|Bulgaria]] was [[Boris III]], who replaced [[Ferdinand I of Bulgaria]] 1918. In [[Serbia]], the title was used in 1346—1371. The last tsar to rule Serbia was [[Stephen Uroš V]]. In the [[Russian Empire]], the title was used from 1546 until 1721. Starting in 1721, the title of Russian emperors was ''imperator'', but the word ''tsar'' remained in common use until the [[Russian Revolution]] in 1917. The last tsar to rule [[Imperial Russia|Russia]] was [[Nicholas II]], who replaced [[Alexander III of Russia|Alexander III]] in 1894. The system of government used during the [[Tsardom of Russia]] and the [[Russian Empire]] was called [[Tsarist autocracy]], also known as Tsarism. ''Tsar'' is also spelled ''tzar'', ''czar'', and ''csar''. It is the [[Eastern Europe]]an word for ''[[Caesar (title)|caesar]]''. It can be translated to ''[[emperor]]''. [[Category:Royalty and nobility]]