Kammala jumla mai zuwa: Birnin daga karshe ya fada ga Daular Byzantine a 1018, bayan
Nasarar Byzantine na Bulgaria. Sredets ya shiga cikin tayar da hankali na Peter Delyan a cikin 1040 <unk> 1041 a cikin yunƙurin da bai yi nasara ba don dawo da 'yancin Bulgaria kuma shi ne mafaka ta ƙarshe na' yan tawaye, wanda kwamandan yankin Botko ya jagoranta. An sake haɗa shi cikin Daular Bulgaria da aka maido a cikin 1194 a lokacin Sarkin sarakuna Ivan Asen I kuma ya zama babban cibiyar gudanarwa da al'adu. Da yawa daga cikin gwamnonin birnin 'yan gidan sarautar Bulgaria ne kuma suna da taken "sebastokrator", na biyu mafi girma a lokacin, bayan sarkin. Wasu sanannun masu riƙe da taken sune Kaloyan, Peter da danginsu Aleksandar Asen (ya mutu bayan 1232), ɗan Ivan Asen I na Bulgaria (). A cikin ƙarni na 13 da 14 Sredets ya kasance muhimmiyar cibiyar ruhaniya da adabi tare da gungun gidajen ibada 14 a cikin kewayensa, wanda daga baya Ottomans suka lalata. Birnin ya samar da kayan kwalliyar sgraffito masu launuka iri-iri, kayan ado da kayan ƙarfe. A cikin 1385, Sredets ya kama shi da Daular Ottoman a lokacin Yaƙe-yaƙe na Bulgarian-Ottoman ta Lala Şahin Pasha, bayan kewaye na watanni uku. Kwamandan Ottoman ya bar kwatancin garuruwan birni kamar haka: "A cikin sansanin soja [Sofia] akwai babban rundunar soja, sojojinsa suna da nauyi, masu gemu kuma suna kama da yaƙi, amma ana amfani da su don cinye giya da rakia<unk> a cikin kalma, 'yan wasa masu farin ciki. "