Kammala jumla mai zuwa: A cikin 1040, Peter Delyan ya yi tawaye da mulkin Byzantine a cikin Theme na Bulgaria. Ƙungiyar
An fara tayar da hankali a Belgrade inda aka ayyana Delyan a matsayin Sarkin sarakuna. Ya tafi kudu, ta hanyar Rascia da Dendra, sannan ya ɗauki sansanonin Byzantine na Naissus da Skopie.