A cewar littafin tarihin Bulgaria Anonymous, ya kashe Wallachian voivode Dan I na Wallachia a watan Satumba 1386. Ya kuma ci gaba da rashin kwanciyar hankali da Ivan Sratsimir, wanda ya karya dangantakarsa ta ƙarshe da Tarnovo a 1371 kuma ya raba dioceses na Vidin da Tarnovo Patriarchate. .'Yan'uwan biyu ba su ba da hadin kai ba don tunkude mamayewar Ottoman .In ji ɗan tarihi Konstantin Jireček, ’yan’uwan sun shiga wani rikici mai zafi game da Sofia.Ivan Shishman ya yi watsi da wajibcinsa na tallafawa Ottoman tare da sojoji a lokacin yakin neman zabe.Maimakon haka, ya yi amfani da kowace dama don shiga cikin haɗin gwiwar Kirista tare da Sabiyawa da Hungarian , yana haifar da mamayewar Ottoman a 1388 da 1393.