Kammala wannan jumla: Jerin yaƙe-yaƙe na cikin gida da ke kewaye da hauhawar mai mulkin Byzantine mai shekaru tara John V Palaiologos ya amfana da Orhan sosai. A cikin yakin basasa na Byzantine na 1341 <unk> 1347, mai mulki John VI Kantakouzenos ya auri 'yarsa Theodora zuwa Orhan kuma ya yi amfani da mayaƙan Ottoman a kan abokan hamayyar masarautar, yana ba su damar kwashe Thrace. A cikin
Yaƙin basasa na Byzantine na 1352<unk>1357, Kantakouzenos ya yi amfani da sojojin Ottoman a kan John V, yana ba su damar amfani da sansanin soja na Turai a Çimpe a kusa da 1352. Wata babbar girgizar kasa ta lalata Gallipoli (Gelibolu na zamani) shekaru biyu bayan haka, bayan haka dan Orhan, Süleyman Pasha, ya mamaye garin, yana ba Ottomans wata gada mai ƙarfi a cikin babban yankin Turai.