EXPLORATIONS ON KOZI GRAMADI PEAK (Ivan Hristov – ivchristov70@abv.bg, Gavrail Lazov) The Thracian royal residence was built on a leveled rock platform situated at the lowest slope of Kozi Gramadi Peak. It covered an area of 0.45 ha. Building No. 1 with an area of 104 sq. m, built in the middle of the 4th century BC, was situated in the middle of the residence. The foundations of two other buildings were documented to the southeast and northeast of Building No. 1. They were built during the Late Antiquity (4th – 5th century AD) with ashlars taken from the demolished Building No. 1. The Thracian residence had a fortification wall 218 m long. It was polygonal, constructed of roughly cut ashlars with an emplectum. The western fortification wall was 44 m long. There was a bastion, 3.60 m by 2.20 m in size, situated in the southwestern corner from the inner part of the fortification wall. The wall in the southwestern corner was 2 m wide. The northern fortification wall was 50 m long and 1.40 m wide. The northeastern fortification wall was 44 m long and the southern fortification wall was 80 m long. Two fortification towers were situated in the southeastern corner of the residence. The earlier tower covered an area of 30.25 sq. m and was built around a cut rock. The later tower, 5.50 m by 5.80 m in size, was adjacent to the southeastern corner of the fortification wall. A passage, situated between the outer and the inner fortification wall, 32 m long and 1.20 m wide, was documented. The finds from the excavations included Thracian sherds of the Early Iron Age and of the 4th century BC, including from imported Greek amphorae and black-gloss pottery, an iron fibula of the 8th – 7th century BC, an iron ring-stamp of the 4th century BC, iron nails, lead sling-bullets and iron arrowheads. The Thracian residence functioned during the 4th century BC. Then the site was abandoned and unoccupied for c. 600 years, when it was reoccupied in the 4th century AD.