At the time of the Romans, a military camp had been installed on the site of the current suburb of Óbuda. The amphitheatre from this camp is today one of the remains from it. Measuring the seats, around 15,000 spectators could attend the competitions, races, fights and games in the circus which were held in the arena. This measured 131 m in length and 107 m in width. For the record, the Coliseum in Rome had 45,000 seats.