Rubuta ci gaba don wannan sakin layi - A cikin karni bayan mutuwar Osman I a 1326, mulkin Ottoman ya fara fadada kan gabashin Bahar Rum da Balkans, a hankali da farko kuma daga baya da gaske. An kama Gallipoli
a cikin 1354, ta yanke Daular Byzantine daga yankunanta na nahiyar; an kama muhimmin birni na Thessaloniki (tare da yawan jama'a fiye da London a lokacin) daga Venetians a cikin 1387, kuma nasarar Turkiyya a Yaƙin Kosovo a cikin 1389 ya nuna ƙarshen ikon Serbia a yankin, yana share fagen faɗaɗa Ottoman zuwa sauran Turai.