A cikin 1369, Turkawa Ottoman karkashin Murad I sun ci Adrianople (a cikin 1363) kuma suka mai da shi babban birni mai fa'ida.A lokaci guda kuma sun kame garuruwan Bulgaria na Philippopolis da Boruj (Stara Zagora).Yayin da Bulgeriya da sarakunan Serbia a Macedonia suka shirya don yaƙi da Turkawa, Ivan Alexander ya mutu a ranar 17 ga Fabrairu 1371. 'Ya'yansa Ivan Sracimir suka gaje shi a Vidin da Ivan Šišman a Tǎrnovo, yayin da sarakunan Dobruja da Wallachia suka sami ƙarin 'yancin kai. .A ranar 26 ga Satumbar 1371, Daular Usmaniyya ta yi galaba a kan wata babbar runduna ta Kirista karkashin jagorancin 'yan'uwan Serbia Vukašin Mrnjavčević da Jovan Uglješa a yakin Maritsa.Nan da nan suka juya kan Bulgaria kuma suka ci arewacin Thrace, Rhodopes, Kostenets, Ihtiman, da Samokov, tare da iyakance ikon Ivan Shishman a cikin ƙasashe zuwa arewacin tsaunin Balkan da kwarin Sofia.Ba zai iya jurewa ba, an tilasta wa Sarkin Bulgeriya ya zama Basaraken Ottoman, kuma a sakamakon haka ya kwato wasu garuruwan da suka bata ya kuma samu zaman lafiya na tsawon shekaru goma.