The term 'gladiatorial sites' refers to the ARENAS in which gladiators fought in Ancient Rome. These ARENAS were known as 'ARENAS' and were typically large, open-air structures with seating for spectators. The most famous of these ARENAS was the Colosseum in Rome, which was built in the first century AD and could hold up to 50, 000 spectators. Other gladiatorial sites included the Circus Maximus, the Flavian Amphitheatre, and the Forum Romanum.