English: Military amphitheatre. In the time of Caesar Antoninus Pius, in the mid 2nd century, the legio II Adiutrix constructed the seventh largest amphitheatre in the Roman Empire. Its oval arena is even larger than that of the Colosseum in Rome! In the amphitheatre constructed of stone and earth, over ten thousand spectators at once could enjoy the gladiator and animal fights and performances. The over twelve meters high outer ring-wall of the amphitheatre was reinforced with twenty some buttresses. The height of the inner wall running round the arena was originally four metres, in order to provide the spectators with appropriate protection against the wild animals. In 1938 the ruins of the amphitheatre were excavated, and these were restored in 1942. Source: Obuda tourism (PDF) – 5 Nagyszombat Street, Budapest District III