​KOPRÜLÜ, or Kuprili (Bulgarian Valésa, Greek Vélissa), a town of Macedonia, European Turkey, in the vilayet of Salonica, ​situated 600 ft. above sea-level, on the river Vardar, and on the Salonica-Mitrovitza railway, 25 m. S.E. of Uskub. Pop. (1905), about 22,000. Koprülü has a flourishing trade in silk; maize and mulberries are cultivated in the neighbourhood. The Greek and Bulgarian names of the town may be corrupt forms of the ancient Bylazora, described by Polybius as the chief city of Paeonia.