A small room off the centre of the right side of the atrium served as a cult room. This room initially served as an ala and was transformed into a cult room in the last period before eruption. Against the east wall stood an aedicula shrine. This comprised of two doric columns in front and two rectangular pilasters at the rear which supported an architrave and pediment. It is believed that the tympanum originally had a painting of a Gorgan head on it. Excavation reports indicate that there was originally a gate on the aedicula that could be closed between the columns. It sat on top of a large masonry base that was coated in stucco and painted in red and yellow imitation marble. The top of the base was outlined by a red stripe. In the centre of the base was an embedded marble slab with an inscription relating to household cult. The walls of the room were painted. On the right side of the aedicula were two male figures standing beside an altar. One of the men was holding an acerra. On the left side were three men leading a bull to sacrifice. One of these men was identified as the popa. All of the wall paintings were carried out in the fourth style and also included panels depicting plants, a cupid, and a swan. Above the wall paintings, a series of stucco cornices ran around the room. The floor of the room was cement. The decoration has largely disappeared today.