During 2004 the upper part of a colonnade was uncovered at the northern edge of the excavation. The east-west colonnade was of African marble columns (originally 6 but only 4 are visible) topped by white marble capitals of Asiatic Corinthian type on which were positioned brick platbands, faced with polychrome stucco work, probably alternating with arches. New fragments belonging to the statue of Dionysius, found in 2003, also emerged.

Excavation continued in the area south of the arched building, delimited on the south side by a wall of small tufa blocks on an east-west alignment. This wall was joined to the structure with arches and pilasters by two transverse walls forming a sort of three sided exedra. Each of the three sides had a large door at the centre. Of the two side walls only the limestone thresholds remain; of the central wall, surmounted by a tympanum and flanked by two semicircular niches, part of the polychrome stucco decoration was preserved. In the area of the exedra and the area south of it the excavation defined the chronology of the collapse of the walls which overlay an abandonment layer which produced pottery datable to the second half of the 5th century. This attests that the sequence of abandonment-collapse-re-occupation-burial of the complex must fall within the period 450-472. The discovery of traces of floor levels above the rubble layers suggest there was an intermediate phase between the collapses and the burial of the site, thus providing a more comprehensible sequence.

The exedra was paved with white mosaic, cut in several places when a number of tanks delimited by low walls were built. The brick pavement and the tract of opus signinum to the north and south of the eastern pilaster also belong to this phase, as does the tank positioned at the bottom of the pilaster itself. These structures probably relate to the installation in this part of the complex of a craft working activity involving the use of water.

The excavation undertaken in the western sector, behind the wall with niches, where a rectangular room was uncovered in 2003, revealed an opening on the south side. This was blocked by the construction of an apse, up against the south face of the wall, which was decorated with an opus sectile pavement and marble veneered walls (partly removed). This structure was later closed by a blocking which was linked to a transverse wall which divided the space in half. (MiBAC)