The excavations undertaken during this second campaign defined and documented important previously unknown or only partially known topographical aspects of the Roman municipium of Trebiae. Two different sectors were enlarged, Sector I and Sector II.
Two different walls, at right angles to each other, were uncovered in sector I and probably relate to a late antique-early medieval phase. The structures, whose complete original layout is unknown at present, seemed to be connected to an area in which various types of materials were recycled, such as metals, glass, and marble, as indicated by the presence of substantial traces of burning, slag and waste products.
The type and construction technique of the structures found in sector II indicate they were part of a Roman domus. One of the rooms presented a mosaic floor of medium and small pink and black tesserae. The decorative scheme was formed by vegetal and figured motifs alternating with geometric borders. A threshold, framed by a double band of black and pink tesserae, presented a motif with trails of heart-shaped ivy leaves rising out of a central decoration which included two facing peltae of pink tesserae.

The mosaic’s central panel presented a more complex decoration with an octagon within a square, bordered by a braid of two continuous threads in pink, white and black tesserae. The space inside the octagon was edged by a second border, with a black and pink running wave motif that delimited the area occupied by the central decoration depicting the Gorgon. The Gorgon’s face, with rather ill-defined features, is formed of black, white, and pink tesserae, while the two wings crowning the head and the snakes surrounding the face are depicted in glass paste tesserae. The very well-preserved floor can be dated to the 3rd century A.D. Given its size and the decorative motif of the mosaic, the room can be interpreted as a small cubiculum.
Two corridors, with opus signinum floors, must have linked the cubiculum to the other rooms of the domus, while a staircase led to an upper floor, whose existence at present is only a hypothesis. The limited dimensions of the rooms and their development suggest that this complex was a house within an urban context, and could not therefore develop over a larger area.

The preliminary study of the pottery, glass and coin finds date the site’s occupation to between the 3rd century B.C. and the 7th century A.D. A chronological series has also been created that makes it possible to associate the finds with the various structures identified.