Re: A slavic oligarch is the exact equivalent of a western successful businessman
Tsar is a Ceasar in "barbarian" languages. Peter the Great was wrongly informed from his pals that tzar is just a slav king , so Peter I adopted emperor instead of tzar and punished badly folks who still call him tzar:)
P.S. Bunch of Roman rulers was "Ceasers" until end of the paxromana where they switched to emperor and added autocrat later .
Autocrat is what I like mostly :)