 Kuti azviratidze semutsivi akakodzera kuna baba vake kumba uye mumaziso ehurumende dzekunze, Peter akatanga kutonga kwake nekurwisa kwemauto muByzantine Thrace muna 927 yaive yekupedzisira hondo yeByzantine-Bulgarian hondo ya913-927. Kunyange zvakadaro, akaenderera mberi nokubudirira kwake nokukurumidza nokutaurirana muchivande chibvumirano chorugare hurumende yeByzantium isati yava nomukana wokutsiva. Mambo weByzantium Romanos I Lakapenos akagamuchira nokudisa chikumbiro chorugare ndokuronga muchato wezvematongerwe enyika pakati pomuzukuru wake Maria namambo weBulgaria. Muna October 927 Peter akasvika pedyo neConstantinople kuzosangana naRomanos ndokusaina chibvumirano chorugare, achiroora Maria musi wa 8 November muchechi yeZoödochos Pege. Kuti aratidze nguva itsva muukama hweBulgaria neByzantium, muchindakadzi wacho akatumidzwazve zita rokuti Eirene rugare. Pfuma yakakura yePreslav inofungidzirwa kuti inomiririra chikamu chechirikadzi yamambo. Chibvumirano cha927 chaizvoizvo chinomirira chibereko chebudiriro dzaSimeoni dzechiuto nematanho edzimwe nyika, ayo akapfuuridzirwa nounyanzvi nehurumende yomwanakomana wake. Rugare rwakawanwa nemiganhu yakadzorerwa kune iya yakatsanangurwa muzvibvumirano zva 897 na 904. VaByzantine vakabvuma zita ramambo weBulgaria rekuti mambo basileus, tsar uye chinzvimbo che autocephalus cheByzantine patriarchate, nepo kubhadhara mutero wegore negore kuBulgaria neByzantine Humambo kwakagadziridzwa. 