Kastoría, town and dímos (municipality), West Macedonia (Modern Greek: Dytikí Makedonía) periféreia (region), northern Greece. The town stands on a promontory reaching out from the western shore of Lake Kastorías. The lake is formed in a deep hollow that is surrounded by limestone mountains. The town was apparently named for the beavers that have long been the basis of a local fur trade, though trading in mink now predominates in the area. Kastoría has been identified with ancient Celetrum, which was captured in 200 bce by the Romans. According to the 6th-century-ce Byzantine historian Procopius, the site was later renamed Justinianopolis. In 1083 it was captured by the Norman adventurer Robert Guiscard from a small English garrison. In the 12th century it was contested by the despotate of Epirus and the Byzantine emperors seated at Nicaea, and from 1331 to 1380 it was held by the Serbs. The Turks took over about 1385 and retained control until 1912, when it passed to Greece. A number of the town’s 54 (originally 72) Byzantine and medieval churches have been restored, thus making Kastoría a centre for the study of basilica architecture and frescoes. The town serves as the seat of a metropolitan bishop. Pop. (2001) town, 15,615; municipality, 37,094; (2011) town, 13,387; municipality, 35,874.