Nyorai kuenderera mberi kwechikamu chino - Catepanate yeRas yakavambwa pakati pa 971<unk>976, panguva yekutonga kwaJohn Tzimiskes (r. 969 <unk> 976). Chisimbiso che"strategos" yaRas chakanyorwa kuti ndechepanguva yaitonga Tzimiskes, zvichiita kuti zvibvire kuti Nikephoros II Phokas, uyo akatangira Tzimiskes, aizivikanwa muRascia. "Protospatharios naKatepano weRas" aiva gavhuna weByzantium ainzi John. Mashoko pamusoro pe"katepano" yeRas munguva yokutonga kwaTzimiskes haapo. Kuvapo kwemauto eByzantium kwakaguma nokukurumidza pashure pacho nehondo neBulgaria
, uye yakadzorerwa chete ca. 1018 neThema yeSirmium, iyo, zvisinei, haina kuwedzera zvakanyanya muSerbia chaiyo.