Left of the atrium of Felix Romuliana archaeological site, there was a large hall with an apse. In a Roman house it would be the dining room, the Triclinium, and within the palace there would probably be a hall in which the emperor received his official visitors. The atrium with a fountain was organically connected to the hall, which can be concluded from the position of the fountain (set on the axis of the door of this hall). The floor of this room was covered with mosaics. Right next to the threshold of the door a mosaic was discovered which represents Dionysus at a feast, an illustration of Galerius’s entire ruling ideology and one of the most beautiful works that Roman art has bequeathed us. This mosaic is kept in the National Museum in Zaječar.