EXPLORATIONS OF THE THERMAE IN DIOCLETIANOPOLIS (Mitko Madzharov – m_madjarov@abv.bg, Dimitrinka Tancheva) The excavations in the thermae of Diocletianopolis, which date to the end of the 3rd and the beginning of the 4th centuries AD, continued in 2004. A room additionally built and adjoining the outer southern wall of the baths was discovered to the south of room No. 1. It was built in opus mixtum. The southern wall of the room adjoins the western wall and neither are bonded. The floor consists of bricks arranged on a plaster of mortar. The floor level of the room is considerably higher than the floor level of the baths, which is at c. 1.50 m below the floor levels of rooms Nos. 1 and 2. Two lines of terracotta pipes, 18 cm in diameter, were discovered close to the northern wall of the room. The pipes run alongside the southern wall of the baths, from the outer side of the southern niche of room No. 1. The pipes lie on a bed of mortar and are connected to each other through insertions. Most likely, the pipes were used to supply the baths with mineral water. An entrance towards another room, 75 cm in width, was discovered close to the pipes. The finds from the excavations include sherds of the 3rd – 4th centuries AD. The explorations of the western wall of the baths continued. A pavement of bricks arranged on a layer of stones and mortar was discovered from the outer side of the wall. A drain was constructed in the southern part of the wall. The drain lies considerably higher than the level of the rooms inside the baths.