EXPLORATIONS IN DOROSTOLUM – DRASTAR (Georgi Atanasov – geoatal@abv.bg, Nikolai Russev, Denislav Denev) Pentagonal tower No. 3, which is situated on the southern fortification wall of the Early Byzantine castellum Dorostolum, was partly discovered. The fortification wall has been explored in 1984 – 1986. This is the third pentagonal tower in the fortification system of Dorostolum of the 6th century AD that was discovered. The tower was restored around the beginning of the 9th century AD and was used until the end of the 18th and beginning of the 19th centuries, when it was demolished and used as a quarry for building material. The southwestern side of the tower, 6.70 m in length, was explored. It is built of ashlars bonded with mortar and has an emplectum of uneven stones with a bonding medium of mortar. Two courses of the structure were preserved, the first one 47 cm in height. The ashlars are from 70 cm to 1.15 m in length. The southeastern side of the tower is preserved in one course. An occupation stratum, c. 1 m in thickness, containing sherds of the 4th – 5th centuries AD, was registered in front of the southwestern outer side of the tower. A layer with traces of fire, c. 20 cm in thickness, containing remains from construction activities and sherds of the 6th century AD and of the 10th – 11th centuries, was discovered above the earlier stratum. Pottery dated from the 10th – 11th to 14th centuries was found above. Four Christian burials were discovered in front of the southern outer side of the tower. Two copper earrings and two glass bracelets dated to the second half of the 11th – 12th century were found in Grave No. 2. The graves belong to the Mediaeval necropolis situated in front of the southern fortification wall of Drastar, which has been explored in 1984 – 1987. The southern fortification wall was traced out at 12 m in length to the east of pentagonal tower No. 3. A triangular tower was registered there. It is identical to the triangular tower already explored, which is situated at the same distance to the west of pentagonal tower No. 3.