ODESSOS (Alexander Minchev – aleksander.minchev@gmail.com, Valeri Yotov, Elina Mircheva) Two connected rooms with hypocausts were excavated. The southern wall of the southern room was apsidal. The hypocaust was supported by pilae built of stones or bricks and by terracotta tubes, which were covered with bricks and stone slabs. Part of a floor paved with marble slabs was discovered in the northern room. The walls were constructed in opus mixtum. The new discoveries, placed in the context of the rooms with pools plastered with hydraulic mortar and faced with marble veneer, excavated in 2018, showed that the building was a thermal complex. The walls in some rooms were faced with marble veneer and color plaster. Tepidaria and caldaria with floors paved with marble plates were situated in the western part of the thermae and a large cistern was constructed close to their northern side. Frigidaria with pools faced with marble veneer were situated to the east. A laconicum with a large ellipsoid pool faced with marble veneer was situated almost in the middle of the building. Apoditeria with floors paved with bricks were situated in the southeastern part of the building. A sector of a wall was discovered, 90 cm wide and built in opus mixtum, probably the northern wall of the thermae. The finds included over 250 copper coins, mostly of the 4th – 6th centuries AD, glass fragments, sherds, mostly from amphorae and their lids, but also from imported red-slip pottery, a bronze clasp from a toiletries box showing a figurine of Heracles. Judging from the finds, the building functioned during the 5th – 6th centuries AD and was reconstructed and repaired at least once or twice. During the second half of the 6th century AD, the building was damaged probably during an earthquake and subsequently it was not reconstructed and was abandoned.