Located in Amman, it is an imposing monument set into the side of the mountain down the hill from the Citadel and connected to it via long and deep hidden tonnel. It is the most impressive legacy of Roman Philadelphia (Amman) built under Emperor Antoninus Pius (138-161 AD).
Its 33 rows once seated 5000 spectators for performances and possibly also had religious significance. It is still in regular use for theatrical and entertainment productions. The Forum was built in front of the Theater under Commodus in 189-190 AD.