In the “De Administrando Imperio” (c. 948–952), Constantine VII Porphyrogennetos describes the Serbs as settlers placed in the Balkans by imperial authority. He also writes that the Serbs were slaves of the Romans and that “Serb” actually derives from “serbula” meaning “slave” or “Someone who wears cheap clothes”.


Source
Constantine VII Porphyrogenitus, De administrando imperio, ed. Gyula Moravcsik, trans. R. J. H. Jenkins (Washington, D.C.: Dumbarton Oaks, 1967).
