is tsar and czar the same thing?
Tsar (/zɑːr, sɑːr/ or /tsɑːr/), also spelled czar, or tzar or csar, is a title used to designate East and South Slavic monarchs or supreme rulers of Eastern Europe, originally the Bulgarian monarchs from 10th century onwards, much later a title for two rulers of the Serbian State, and from 1547 the supreme ruler of the ...