SERDICA (Konstantin Shalganov – director@sofiahistorymuseum.bg) The explorations of the first insula to the south of decumanus maximus of Serdica and to the west of via sagularis along the eastern fortification wall continued. The insula was 29.30 m wide (north – south). The partly-preserved decumanus maximus was documented in the northern part of the sector. It was explored in 1968 – 1970, when the eastern fortification gate of Serdica and 29 m from decumanus maximus were discovered. In 2011, the street level of the 6th century AD was discovered, 29.25 m long, 6.35 m wide and paved with slabs 20/25 cm thick and reused architectural elements. At 50 cm below the pavement, remains from the earlier decumanus maximus of the end of the 3 – beginning of the 4 century AD were discovered. A drain was explored along the longitudinal axis of decumanus maximus. Its size was 0.62 m by 1.10 m, with walls built of boulders and roughly-cut stones bonded with mortar and bottom paved with bricks, 33/35 cm by 33/35 cm by 4/4,5 cm in size. A double water-conduit was documented under the pavement of the street, at 1.10 m to the north of the drain and parallel to it. Its terracotta pipes were 50 cm long and 14 cm in diameter. A pedestrian gallery, 2.10 m wide, was discovered to the south of decumanus maximus. Two bases of columns from the colonnade were found. The peristyle yard of the domus was discovered. It was 10.30 m long, paved with slabs 20 cm thick, with galleries 2.50 m wide. Parallel rooms arranged in a line were discovered to the south, west and north of the peristyle yard, two of them with mosaics on their floors. The domus dated to the 4th – 6th centuries AD. Three rooms of the 17th – 18th centuries were discovered in the western part of the site.