the.com/tsar

means A title for an emperor or absolute ruler — historically the monarchs of Russia, and now loosely any czar-like authority figure or boss given sweeping control over one area (a 'drug tsar,' a 'tsar' of some government program).

from Traced back through Russian and other Slavic languages to 'Caesar' — the name of the Roman dictator Julius Caesar, which became a byword for 'emperor' across Europe. Latin Caesar passed into Gothic as 'kaisar,' and from Slavic borrowings of that imperial title came 'tsar' (also spelled czar), first worn by rulers of Bulgaria and Serbia before becoming the title of the Russian monarchs. So the word is literally a worn-down, Slavicized echo of one man's family name, stretched across two millennia from a Roman general to a modern 'drug tsar' with a clipboard.