The 2010 marked the 12th season of archaeological excavation undertaken in the site of Bylis, and had as its primary aim to finish the excavation of the Episcopal quarter. During this year the excavations in the winery continued (room N3 and N3A) and as well as those in the southern façade of building K-P (room P2). Also an expansion of the sondage opened in 2006, in front of the façade of the quarter and in the cardo which passes alongside the proto-Byzantine wall, was carried out. To the south-east of building K-P, the north-east circulation axis was blocked by a north-east and south-west wall. The wall, which is built of large stone blocks, at the corner of room P3, turns toward the west, creating a passage way in front of the façade of building K-P. Also, traces of another wall, suggest a line that closed the complex and the Episcopal property in the south.
The excavations in front of the surrounding wall toward the south and east (sondage P2B), identified a thin clay layer, which is the last circulation level of use before the abandonment of room P3 and the collapse of its roof. Below this layer, two north-south and west-east walls were uncovered, which relate to each-other and are preserved at the same height. The north-south wall, which abuts the surrounding wall of the Episcopal complex, follows the same direction as the Hellenistic road, and is cut by the southern foundation of room P3. The two walls seem to have been part of a structure, destroyed before the rearrangement of this part of the urban quarter in the 6th century AD. This is confirmed by the discovery of earlier walls in the same level of the structure, and below the yard of building K-P and N. The excavations in building N, showed that it was extended toward the east of the façade of the cathedral’s complex, and consisted of 4 inner areas: room N5 to the east, reached through the yard; the cellar N2 to the south-west, which is opened above the warehouse (33); N3 to the north-west; and a small room N3A, which enabled the communication between the three abovementioned rooms. Four pithoi and two grape pressing tanks were identified in room N5. One of the tanks was situated in the south-eastern corner while the other was in the north-east, and was extended toward the west in a pool, used for product collection and processing. A tile made channel, which passed through the dividing wall, linked the pool with the deep fermenting cistern in room N3A. The walls of the cistern are made of stones and tiles bonded with mortar, where these latter formed in the upper part a kind of gutter closed with a wooden lid. The inner walls and the rims of the cistern are covered by two layers of waterproofing mortar. The excavations to the east of room N3 revealed a roof destruction layer, and below it, an in situ entirely preserved pithos. The lower destruction and abandonment layers were rich in pottery materials and iron objects, such as nails and frame fragments.