Bulgaria da aka ta da daga matattu sun mamaye yankin da ke tsakanin Tekun Bahar, Danube da Stara Planina, ciki har da wani yanki na gabashin Makidoniya, Belgrade da kwarin Morava.Har ila yau, ta yi iko da Wallachia ^[29] Tsar Kaloyan (1197-1207) ya shiga ƙungiya tare da Papacy, don haka ya sami amincewa da lakabinsa na "Rex" (King) ko da yake yana so a gane shi a matsayin "Sarki" ko "Tsar". "Bulgarian da Vlachs.Ya yi yaƙe-yaƙe a kan Daular Rumawa da (bayan 1204) a kan Ƙwararrun Ƙwararru na Hudu , ya ci manyan sassa na Thrace, Rhodopes, Bohemia, da Moldavia har ma da dukan Makidoniya.A yakin Adrianople a shekara ta 1205, Kaloyan ya ci karfin daular Latin kuma ta haka ya takaita ikonsa tun farkon shekarar kafuwarta.Ƙarfin Hungarian da har zuwa wani lokaci Sabiyawan sun hana gagarumin faɗaɗa zuwa yamma da arewa maso yamma.A karkashin Ivan Asen II (1218-1241), Bulgaria ta sake zama ikon yanki, ta mamaye Belgrade da Albania .A cikin wani rubutu daga Turnovo a 1230 ya ba da kansa "A cikin Almasihu Ubangiji mai aminci Tsar da autocrat na Bulgarians, dan tsohon Asen".An maido da Patriarchate na Bulgarian Orthodox a cikin 1235 tare da amincewar duk Patriarchates na gabas, don haka ya kawo ƙarshen ƙungiyar tare da Papacy.Ivan Asen II yana da suna a matsayin mai mulki mai hikima da mutuntaka, kuma ya buɗe dangantaka da yammacin Katolika, musamman Venice da Genoa , don rage tasirin Rumawa a kan ƙasarsa.Tarnovo ya zama babbar cibiyar tattalin arziki da addini - "Romawa ta uku", sabanin Konstantinoful da ke raguwa.^[30] Kamar yadda Saminu Mai Girma a lokacin daular farko, Ivan Asen II ya faɗaɗa yankin zuwa gaɓar tekuna uku (Adriatic, Aegean da Black), ya mamaye Medea - sansanin soja na ƙarshe a gaban bangon Constantinoful, bai yi nasara ba ya kewaye birnin a 1235. kuma ya dawo da lalata tun 1018 Patriarchate Bulgarian.Sojojin kasar da tattalin arziki sun ragu bayan kawo karshen daular Asen a shekara ta 1257, suna fuskantar rikice-rikice na cikin gida, hare-haren Byzantine da Hungarian akai-akai da kuma mamayar Mongol .^[31] Tsar Teodore Svetoslav (ya yi mulki 1300-1322) ya maido da martabar Bulgaria daga 1300 zuwa gaba, amma na ɗan lokaci.Rikicin siyasa ya ci gaba da girma, kuma Bulgaria a hankali ta fara rasa yanki.