 Nyora kupfuurira kweiyi ndima - Nekuda kwehondo dzinodhura uye dzisina kubudirira, kurwiswa kwakadzokororwa kweMongolia, uye kusagadzikana kwehupfumi Constantine aive mutongi wekutanga weBulgaria kunyora mari yake pamwero mukuru, hurumende yakatarisana nekumukira muna 1277. Rutivi rwomunzanga norwezvemari rweiyi sangano rwakasimbiswa navanyori venhau veMarxist, asi mavara aro echokwadi haasinganzwisisiki. Chinhu chakajeka ndechokuti mufudzi kana kuti muridzi wenguruve ainzi Ivaylo akava mutungamiriri wevasina kugutsikana uye akakwezva vateveri vakawanda vanofungidzirwa kuti zvikurukuru veboka repasi, achisimbisa kudzora kwake nzvimbo huru. Constantine akaenda kundorwisa Ivaylo navarindi vake, asi akakundwa zvakasimba uye akaurawa mungoro yake. 