This theatre was built in the Augustinian period and once occupied a quarter of the standard urban plan of the Roman colony. The southern façade, built of the local stone, puddinga, is still standing. Originally, it had a stage 45 metres long and 7 metres deep and room for 4,000 spectators. The theatre measures 22 metres high and has arcades with 3 levels of windows. In Roman times an arcade linked the theatre to the amphitheatre. Today this is incorporated into a wall of a 13th Century convent, but retains the curvilinear structure and eight of the 60 original arcades.