De Administrando Imperio
Serbia consisted of the following fortifications (καστρα, 'castle'): Destinikon (Δεστινίκον), Černavusk (Τςερναωουσκεή), Međurečje (Μεγυρέτονς), Dresneik (Δρεσνεηκ), Lesnik (Λεσνηκ), Salines (Σαληνέζ), in the Zhupa of Bosnia (Βοσνωνα): Katera (Κατερα) and Desnik (Δέσνηκ)."De Administrando Imperio by Constantine VII