Peter I ya tattauna yarjejeniyar zaman lafiya da gwamnatin Byzantine.Sarkin Rumawa Romanos I Lakapenos ya yi ɗokin yarda da shawarar zaman lafiya kuma ya shirya auren diflomasiyya tsakanin jikanyarsa Maria da sarkin Bulgaria.A cikin Oktoba 927 Bitrus ya isa kusa da Constantinople don saduwa da Romanos kuma ya sanya hannu kan yarjejeniyar zaman lafiya, ya auri Maria a ranar 8 ga Nuwamba a cocin Zoödochos Pege.Don nuna sabon zamanin a cikin dangantakar Bulgaro-Byzantine, an sake masa suna Gimbiya Eirene ("salama").Ana tsammanin babban taska na Preslav yana wakiltar wani ɓangare na sadakin gimbiya.Yarjejeniyar ta 927 tana wakiltar 'ya'yan nasarar Saminu na soja da manufofin diflomasiyya, wanda gwamnatin ɗansa ta ci gaba.An sami zaman lafiya tare da iyakokin da aka mayar da su ga waɗanda aka ayyana a cikin yarjejeniyoyin 897 da 904. Rumawa sun amince da sarautar sarkin Bulgarian (basileus, tsar) da matsayin autocephalus na baban Bulgarian, yayin da ake biyan harajin shekara-shekara ga Bulgaria ta hanyar ba da kyauta. daular Byzantine aka sabunta.