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Tsar is a name for the ruler of Bulgaria in 913–1422, later usage in 1908–1946, the ruler of Serbia in 1346—1371 and the emperor of Russia from 1546 until 1721. Since 1721 the title of Russian emperors was imperator, but the word tsar remained in common use until the Russian Revolution 1917. It is also spelled Tzar, Czar, and Csar, and is the Eastern European word for Caesar.
The last Tsar to Rule Serbia was Tsar Stephen Uroš V.
The last Tsar to Rule Russia was Tsar Nicholas II.
The last Tsar to Rule Bulgaria was Tsar Boris III.