Pertempuran Bapheus
Pertempuran Bapheus(Turki: "Bafeus Muharebesi", "Koyun Hisar Muharebesi", "Koyunhisar Muharebesi", "Yalakova Muharebesi") terjadi pada 27 Juli 1302 antara tentara Utsmaniyah dibawah Osman I dan Byzantine army
under George Mouzalon. The battle ended in a crucial Ottoman victory, cementing the Ottoman state and heralding the final capture of Byzantine Bithynia by the Turks. According to Halil İnalcık, the Ottomans achieved its characteristics and qualities of state after this battle ("Bafeus Savaşı") near Yalova.