Nyora kupfuurira kweiyi ndima - Maererano ne "De Administrando Imperio" (DAI), maSerbia akagadzirisa maBalkan pasi pekudzivirirwa kweByzantine Emperor Heraclius (r. 610<unk>41), uye vakatongwa nedzinza rinozivikanwa munhoroondo seVlastimirović dzinza. VaSlav vakanga vatanga kugara munharaunda yacho mukuvamba kwezana ramakore rechi6, pashure pokupinda zvakadzika muUmambo. Vakagadzirisa "vakabhabhatidza Serbia" (iyo "Serbian hinterland", inozivikanwa se "Raška"), iyo yaisanganisira Bosnia, uye nyika dzegungwa ("Pomorje") dzeTravunija, Zahumlje nePagananija, nepo maritime Duklja yaive neByzantine, zvingangodaro zvakagadziriswa nevaSerb futi. Nyika dzose dzomugungwa dzakapoteredza "Serbia yakabhapatidzwa" kuchamhembe. Pakati pezana ramakore rechi9, muvakidzani weBulgaria uyo akanga agara murugare akapinda asi akakundwa muhondo. Serbia yakava yechiKristu muna c. 870, kunyange zvazvo mishoni dzakanga dzaitwa mukati mokutonga kwaHeraclius. Mumakumi emakore akatevera, nhengo dzedzinza racho dzakarwa hondo dzokukwikwidzana, uye Serbia yakava nyaya yokukwikwidzana kweByzantine neBulgaria. Mashoko akanyorwa pamusoro peumambo hunoguma neDAI uye kufa kweMuchinda Časlav (ca. 950), pashure pokunge umambo hwacho hwaparara. VaByzantine vakagadzira catepanate kwenguva pfupi paRas, nehutongi hwechiuto hwakaguma nokukurumidza pashure pacho nekukunda kweByzantine kweBulgaria
, uye yakadzorerwa chete ca. 1018 neTema yeSirmium isingagari kwenguva refu, iyo zvisinei haina kuwedzera zvakanyanya muRaška.