Roman amphitheatres are amphitheatres – large, circular or oval open-air venues with raised seating – built by the Ancient Romans. They were used for events such as gladiator combats, chariot races, venationes (animal slayings) and executions. About 230 Roman amphitheatres have been found across the area of the Roman Empire. Early amphitheatres date from the Republic Period, though they became more monumental during the Imperial Era.