ARCHAEOLOGICAL EXPLORATIONS NEAR THE VILLAGE OF ORIZOVO (Milena Tonkova – milenatonkova@hotmail.com, Yavor Ivanov) Tumulus No. 1 belongs to a necropolis of 15 tumuli. It is 2.50 m in height and 38 m in diameter. A skeleton of stallion, 138 cm in height and with an iron bit in his mouth, was discovered in the southeastern periphery of the tumulus. The bit belongs to Type IV after the classification of W. Werner and dates to the mid 5th – mid 4th century BC. A bone of a leg of another horse, which was 138 – 139 cm in height, was discovered at 7 m to the northeast of the stallion. A skull of a stallion, c. 10 years old, was discovered in the opposite northwestern part of the tumulus. The tumulus consisted of small conical mounds, which were covered with an overall embankment at the end of the piling. No human burial was discovered in the tumulus, but it is possible to suppose that the neighboring tumuli contain human burials. Tumuli containing only sacrificed horses without human burials occurred in ancient Thrace. The remains of the Roman road Via diagonalis are situated among the tumuli in the necropolis.