DEULTUM (Lyudmil Vagalinski – lvagalin@techno-link.com) Spolia were documented in the structure of the fortification tower, including a fragment from a Latin funerary inscription of the 2nd century AD. The explorations of the building with arches constructed of stones and bricks continued to the south of the tower. A room with a hypocaust and marble veneer was discovered. The building was burned after AD 383/408 and the Roman fortification wall was built before that date. Subsequently and before AD 402/450, the Late Antique fortification wall 2.20 m wide, with the trapezoid tower, was built over the Roman wall. This period ended with a fire. Subsequently and before AD 491/518, a reinforcing wall 1.60 m wide was built adjoining the Late Antique northern fortification wall. Most probably, the reinforcement of the wall coincided with the construction of the Early Byzantine fortress that occurred after AD 457/474, during the reign of Leo I the Thracian, or Zeno, or Anastasius I Dicorus, probably due to the Hunnic attacks. The fortress narrowed from the east and from the west the previously fortified area, but preserved and reinforced the previous northern and probably the southern fortification walls. This period ended with a fire after AD 491/518. Subsequently, the northern fortification wall was repaired and buildings of roughly-cut stones bonded with clay and upper walls of sun-dried bricks were constructed, adjoining the inner side of the fortification wall. After AD 574, the fortress was burned during the attacks of Avars and Slavs. During the 7th – 8th centuries AD, ramshackle buildings were constructed over the debris of the northern fortification wall and subsequently, they were burned. The finds from the excavations included sherds, fragments from two funerary inscriptions of the 2nd century AD and 226 coins. According to the archaeozoological and palaeobotanical analyses, meat, common wheat and black pine and oak beams were stored in the fortification tower.