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 Nikephoros II Phokas, uyo akambotonga Tzimiskes, ave achiremekedzwa 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 yakatangwazve c. 1018 neThema yakagara kwenguva pfupi yeSirmium, iyo, zvisinei, haina kuwedzera zvakanyanya muRascia chaiyo. Bosnia inomuka senyika pashure porufu rwaČaslav.