I don't think Polpotian is a word. Some articles on the topic say "in Cambodia during Pol Pot's regime". You don't need the "a". I couldn't find any single adjective that refers to Pol Pot.

Hi :) 1. The 'a' is not needed, if it's a name of a place you don't need 'a'. 2. I don't know, I had to Google it, but it looks like this would be the word to use.

Not sure if "polpotian" is a word. But even if it is, I would say the following to make myself understood to your average English speaker: "In Cambodia lived five days under the Pol Pot Regime."

It depends a little bit on exactly what you mean. We sometimes do this with proper nouns in English. "It was Churchillian", for example. Meaning, characteristic of Churchill, or relating to Churchill. "The Prime Minister thinks of himself as quite Churchillian in his approach". You can also use "esque". "It was quite a Churchilesque speech". Meaning it was a speech reminiscent of Churchill. However, I don't think it works well with Pol Pot because two names are required for it to give meaning to most poeple. You can't really emit the Pol part and it looks odd to concatenate them (PolPot). Maybe you could say: - For five days I stayed in a part of Cambodia reminiscent of Pol Pot. - I spent five days in an area still overshadowed by the effects of Pol Pot. Perhaps if you give a bit more information about what you mean I can give you some ideas? The "a" bit is fine, but you could also emit it, I think.