Near the centre of the peristyle sat a cult building. It took the form of a small temple structure constructed on a rectangular masonry podium, accessible by steps on its northern side. The structure had a rectangular plan. Only 0.70m of the structure has been preserved, however, at each corner there was an imprint of the base of a column which would have supported a roof that was mentioned in accounts from the eighteenth century. In front of the structure was a tufa altar, placed off-centre to the steps. The podium of the structure had been decorated in red stucco, and it was recorded that the tympana were painted blue. A statue of Diana was found within the structure covered in polychrome marble.