From the information board at the site: The largest church in the city was a three-aisled basilica with an entry hall at the west end, a pulpit with two staircases in the centre, and an apse with seating steps for the clergy in the East. The chancel in front of it was separated by a screen, and the apse was set into the main structure of the Roman baths.

The Basilica has a skewed plan, and most of it was built of stone re-used from older buildings. The surviving west staircase of the ambo and the ornamental chancel-screen are early Byzantine works. The church was abandoned around 1300AD.