(also called Kurvingrad)
It is situated to the south from Niš, on the slopes of the Seličevica Mountain above the Južna Morava River. Ancient Romans were the first to use this strategically important spot for their fortification. The Byzantines built the town Complos at the same place. The town was further reconstructed by the Serbs for the purpose of defense against the coming Turkish threats. According to the inscription discovered on the architrave, the town was restored by Nenad, son of the tax-collector Bogdan, in 1372. The apostate Sultan Musa demolished the city in 1413, but the same year it was returned to Despot Stephan Lazarević by the Sultan Mehmed II, as a sign of gratitude for helping him defeat Musa. In the year 1428, the Turks finally took over Koprijan.The town is rectangular in shape (80 x 50 m), and it was encircled with a trench. It is surrounded by ramparts approximately 10 m in height, with the entrance placed on the northeast side. It had five towers. The biggest of them was the donjon on the northeast corner. A cistern was discovered inside the ramparts. Archaeological excavations have not been undertaken so far.