The fortress "Sostra" ("sostra" in ancient Greek means girdle, bandage, barrier) is the sixth road station along the Roman road" Via Trayana ", which connects the province of Lower Moesia with Thrace. It is situated south-east of village of Lomets, 12 km. north of the town of Troyan and 28 km. south of Lovech, in the valley of the Osam river. The Roman roadside station and fortress Sostra are situated…