From 1999 to 2012, a Franco-Albanian team was brought together, under the aegis of the French Ministery of Foreign Affairs, the French School at Athens and the Archaeological Institute of Tirana. They were specialists of the Protobyzantine period around Skender Mucaj, who had carried out archaeological excavations at the late-antique xity of Byllis in the 1980s. The first volume on the site presents a study of part of the structures of Late Antiquity unearthed in this episcopal city in the interior of Epirus Nova: the city wall, altered during the reign of Emperor Justinian, and three of the five known early Christian churches, basilicas A, C and D. Besides the rampart and the architecture of these cult buildings, the sculpture, layouts, liturgical furniture, decoration of the floors and the collected objects offer an exceptionally rich and varied assemblage, still overlooked, which is an essential urban landmark in the southwest of the Balkans.