 Nyora kupfuurira kweiyi ndima - Pashure pokurova kwakakomba kwakaitwa Umambo hweBulgaria naMambo weRus Svyatoslav IMuna 971, vaByzantine, vachiti vari kuzosunungura Bulgaria kubva kuRus, vakatora guta guru rePreslav uye vakadzinga mauto aSvyatoslav kubva kuBalkans. Zvisinei, pashure pezviitiko izvi, Mambo weBulgaria Tzar Boris II akabatwa muConstantinople naMambo weByzantine John I Tzimiskes uye akamanikidzwa kusiya chigaro chake cheumambo pachena. Chikamu chokumabvazuva choUmambo hweBulgaria chakabatanidzwa neByzantium, nepo zvikamu zvokumadokero zvakasiyiwa kuti zvizvitonge uye zvakava pasi pokutonga kwevanakomana vana vagavhuna weBulgaria weSredets Sofia yemazuva ano - Count Nikola. Vanakomana vana David, Moisei, Aron, naSamuil vakazozivikanwa pamwe chete nevaByzantine se Cometopuli vanakomana ve count, uye vaizotungamira kurwisa kweBulgaria kuByzantine subjugation zviri pamutemo muzita remusungwa Boris II. 