The peristyle is porticoed on all four sides with twenty three Ionic columns supporting the inner margins of the roof. A small wall (pluteus) connects the bases of the columns to enclose the garden.

The walls of the ambulatories were painted in the fourth style with red panels with ornamental borders above a lower black frieze. The upper zone was painted white. The pluteus was also painted in the fourth style with a black background and panels of animals and birds.

The columns of the peristyle are of tufa with fluted tops over circular stuccoed bases. The upper fluted shafts were painted white, while the lower parts were black on the garden side, corresponding to the pluteus, and alternating red and yellow on the ambulatory side. In the middle of the peristyle is a garden with a rectangular pool with a fountain.