 Nyora kupfuurira kweiyi ndima - Akakurumbira wechiBulgaria medievalist Vasil Zlatarski anofungidzira kuti mushure mekukunda kukuru kweBulgaria pamusoro peByzantine Empire muhondo yeAchelousmuna 917, mambo weBulgaria Simeon I r. 893927 akadana kanzuru yechechi muna 918 kuitira kusimudza autocephalous Bulgarian Archbishopric kuPatriarchate yakazvimiririra zvachose. Pashure pokukunda paAchelous, Simeon I akada kuti vaByzantine vamuzive kwete chete saMambo wevaBulgaria, izvo vakatoita muna 913, asiwo wevaRoma. Zlatarski anoti chiito chokutanga chaSimeon I pashure pehondo chaiva chokusimudza mutemo weChechi yeOrthodox yeBulgaria, nokuti maererano netsika yeumambo hweByzantium mutongi anofanira kuva nemutungamiriri uye hapana umambo hunogona kuva pasina Patriarchate. 