This theatre is much smaller than the arena and was probably used more for cultural activities and stage plays. It is dated back to around 2AD and was build into the hill on the backside. There is a cavern network under some of the theater that can be seen looking through the grates in the front area.
In Roman times Porta Gemini was the approach to the city theatre. Its semi-circular stone seats were arranged along the east slope of the city hill Kaštel. The remains of the stage house have been preserved at the level of foundation walls and parts of the semi-circular auditorium, which were preserved, reconstructed in part, and presented archaeologically. The theatre had three monumental entrances.
There were two theatres in Pula in classical antiquity. The other, much larger, was located outside the city walls, just like the amphitheatre and made use of the slope of the nearby hill Zaro.
There were two theatres in Pula in Roman times, one on the top of the Montezaro Hill (only a fragments of it left now) and the second one on the Ka?tel Hill, which can be seen on this picture. It is situated right behind the Archaeological Museum of Istria.
Ka?tel Hill dominates the huge port of Pula and here you can see the remains of the fortress from where the Romans have controlled this strategicaly important point.