Kammala jumla mai zuwa: Dangane da "De Administrando Imperio" (DAI), Serbs sun zauna a cikin Balkans a ƙarƙashin kariyar Sarkin Byzantine Heraclius (r. 610<unk>41), kuma daular da aka sani a cikin tarihin tarihi a matsayin daular Vlastimirović. Slavs sun fara zama a yankin a farkon ƙarni na 6, bayan sun mamaye zurfin Empire. Sun zauna "baftisma Serbia" (da "Serbian hinterland", anachronistically da aka sani da "Raška"), wanda ya hada da Bosnia, da kuma Maritime ƙasashe ("Pomorje") na Travunija, Zahumlje da Paganija, yayin da maritime Duklja da aka gudanar da Byzantines, shi aka tabbas zaunar da Serbs da. Duk ƙasashen teku sun yi iyaka da "baftisma Serbia" zuwa arewa. A tsakiyar karni na 9, makwabcin Bulgaria mai zaman lafiya ya mamaye amma ya ci nasara a yaƙi. Serbia ta zama Krista a cikin ca. 870, kodayake an yi ayyukan ne a lokacin mulkin Heraclius. A cikin shekarun da suka biyo baya, 'yan daular sun yi yaƙe-yaƙe, kuma Serbia ta zama batun Byzantine-Bulgarian kishiya. Rubutun da aka rubuta game da daular ya ƙare tare da DAI da mutuwar Prince Časlav (ca. 950), bayan da masarautar ta rushe. Byzantines sun kafa catepanate na ɗan gajeren lokaci a Ras, tare da gwamnan soja ya ƙare ba da daɗewa ba tare da
Byzantine cin nasara na Bulgaria, kuma an sake kafa shi ne kawai ca. 1018 tare da ɗan gajeren lokaci na Sirmium, wanda duk da haka bai faɗaɗa sosai cikin Raška ba.