The Treskavec monastery, built in the 12th century in the mountains about north of Prilep under Zlatovrv peak, at the edge of a small upland plain 1100 meters above sea level. Prilep has frescoes from the 14th and 15th centuries and is probably the site of the early Roman town of Kolobaise. The name of the early town is recorded on a long inscription on stone which deals with a local cult of Ephesian Artemis. The inscription was reused as a base for a cross on top of one of the church domes. Other inscriptions at Treskavec include several 1st century Roman dedications to Apollo. The old fortress was used by the Romans, and later the Byzantines. After all, even Tsar Samuil came here after the defeat at Belasica in 1014. During the Middle Ages, after 1371, Prince Marko rebuilt the citadel extensively, making it an important military stronghold.