*4.2. Description of the Building (Architecture and Materials)*

The archeological works documented the existence of a workshop associated with the glassmaking activity, where the walls were removed revealing the existence of a previous construction. Several compartments coated with *opus signinum* were recognized, ordered according to a west wall that was about 13 m long and oriented north/northwest.

The extension of the excavation works to the east limit made it possible to identify new compartments similar to those initially recovered, showing the presence of a cohesive building, with internal compartmentalization revealing a relative symmetry limited by two walls (east and west), with a wall at its northern limit oriented east/west and parallel to Via XVII (Figure 4C).

The N.A.2 is located on the south part of this necropolis area, on the south side of the road, and was built in close connection with the necropolis, from where the access to the N.A.2 takes place. On the opposite side of the road, there is a set of mausoleums.

Regarding its shape, the N.A.2 has an asymmetrical trapezoidal configuration with its internal structure organized around a central axis, and materialized through a wall oriented north-northeast/south-southwest. This is only perceptible by the existence of foundation of the wall, which separates two areas with perfectly symmetrical compartments (Figure 5). These compartments configure a kind of unit having similar dimensions and constructive solutions, although with different orientations. These are ten watertight units coated with *opus signinum* mortars, lowered to the circulation quota, located at 179.91 m.

**Figure 5.** Plan of the trapezoidal N.A.2 (Building R05) under musealization.

The N.A.2 has a maximum length of 14.22 m, and a width of 8.62 m on the south side and around 6 m on the north side. The compartments have very similar dimensions, varying between 2.10 × 0.90 m and 2.05 × 1.00 m, and were observed to be differently preserved in terms of height. The best-preserved compartment, located on the east side of the building, is about 0.80 m high. The walls and the pavement of all the compartments are coated with *opus signinum*.

The interior of the building can be divided into three distinct spaces, which we call the northern sector, the central sector, and the southern sector.

The access to the building was from the road, through the northern sector of the building. It is limited by the large wall that marked the south side of the road and presents a particular organization, composed of two contiguous compartments with different dimensions, which complete the main body of the building. In this area, a granite threshold was exhumed, confirming the circulation level inside the building, estimated to be at 179.90 m.

The central sector of the building is tight and made up of four compartments, configuring very homogeneous spaces, of about 2/2.15 m in length and 0.96/1.05 m in width, with two compartments on each side, forming an L due to its arrangement. Those compartments abutting to the lateral walls have their major axis oriented to the north/northwest, with the east/west-oriented ones located to the south. In this sector, there is also an open central space, around which the compartments are organized. These compartments show different conservation state and different construction systems. Those located on the east side are better preserved, and the one located on the north side has a maximum wall height of about 0.80 m and is completely covered with well-preserved *opus signinum* mortars. The heights of the base of the compartments, whose lowest quota is at 179.15 m, are 0.76 m below the level of the entrance threshold, which indicates that they were below the circulation level. Regarding the building materials, this sector does not use bricks in internal walls but rather irregular granite stone masonry. At the base, the *opus signinum* coating mortars cover a preparatory level formed by material comprising small stones.

The space located in the south of the building seems to be structured around a central open area. This space has six compartments, three on the east side and three on the west side, organized in an L shape. In fact, on both sides there is a succession of two contiguous spaces, with the major axis (2.10 m) oriented north/northeast, leaning against the lateral walls. Two others, lined up by the south wall of the building and oriented east/west, complete the set and define a narrow circulation corridor of around 1.12 m. In this space, the divisions of the compartments were executed with brick masonry, and the internal walls were made with the same material (Figure 6A). *Lydion* bricks were used with layers of yellowish mortar. The conservation state is variable, with the eastern receptacles have higher walls, something that is related to the construction of the craft space over the N.A.2, whose constructive impact focused on the west area. In any case, the quality of the *opus signinum* mortars that covers the bottom of the compartments is technically very good, showing a complex preparation that is still well preserved (Figure 6B).

**Figure 6.** South view of the N.A.2 (**A**) at the end of the archeological excavation; (**B**) perspective of the compartments on the east side of the building.

As can be seen from the restored floor plan of the building and the description above, its organization, despite the asymmetry of its east and west walls, sets up an interior space designed and structured in a symmetrical way. On the other hand, the building seems to be part of a large enclosure, limited on the north side by the wall delimiting the road; this is blocked by another structure having a northwest orientation, identified next to the CTT block. The area between the building and the wall seems to configure a large open space, without other buildings, and with an undetermined function.
