Pedzisa mutsara unotevera: Musi wa 26 Gunyana 1371, maOttoman akakunda uto guru revaKristu raitungamirirwa nehama dzeSerbia Vukašin Mrnjavčević naJovan Uglješa mu
Hondo yeChernomen. Vakakurumidza kutendeukira kuBulgaria ndokukunda Thrace yokuchamhembe, Rhodopes, Kostenets, Ihtiman, uye Samokov, chaizvoizvo vachiganhurira chiremera chaIvan Shishman munyika dziri kuchamhembe kwemakomo eBalkan neBani reSofia. Asingakwanisi kurwisa, mambo weBulgaria akamanikidzwa kuva muranda weOttoman, uye mukudzoka akawanazve mamwe maguta akarasika uye akachengetedza makore gumi orugare rusina kugadzikana.