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Joseph Grimaldi invented the clown as we know today (a joy for some and deathly fear for other). He lived on the stage since his second year and left it everything that was his.
Circus of Nero began as a place for public trainings of Caligula and Nero and became a place of martyrdom of many early Christians. When it was abandoned it became a place of not one but two basilicas.
Contemporary circus is relatively new subtype of circus (some 50 years relative to 250 of a traditional circus) which mixes elements of its predecessor with higher art and other type of media.
Although almost nothing has left of Circus Flaminius today, we know that it existed and that it was important public place for hundreds of years where games and other public businesses were held.