{single word requests On Saturday afternoon or in the Saturday afternoon? English Language & Usage Stack Exchange|single word requests What is the opposite of “free” as in “free of charge”? English Language & Usage Stack Exchange|orthography Free stuff “swag” or “schwag”? English Language & Usage Stack Exchange|etymology Origin of the phrase “free, white, and twenty-one”? English Language & Usage Stack Exchange|pronouns You can contact John, Jane or me myself for more information English Language & Usage Stack Exchange|English Language & Usage Stack Exchange|grammaticality Is the phrase “for free” correct? English Language & Usage Stack Exchange|meaning “Free of” vs “Free from” English Language & Usage Stack Exchange}
{The idiomatic way to say this in American English is "on Saturday afternoon". If (as the sentence implies) the dictator had once ruled them but now no longer did. The phrase "free of charge" (blue line) has always been vastly more common than "free from charge" (red line), as this Ngram graph shows. But I
