For many its the Roman empire or the Greeks. Similarly ancient Egypt. Or the British empire. Maybe the Japanese, Chinese and Norse as the next 3.
I have deliberately not mentioned time periods there.
These are the most commonly beloved. What are your favourites and why?
Years of Lead in Italy, i don’t know why maybe it’s because something’s still a mistery that needs to be understood https://en.wikipedia.org/wiki/Years_of_Lead_(Italy)