| Battle of Bapheus | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Part of the Byzantine–Ottoman Wars | |||||||||
 Kocaeli Province, Turkey | |||||||||
| |||||||||
| Belligerents | |||||||||
| Byzantine Empire | Ottoman Beylik | ||||||||
| Commanders and leaders | |||||||||
| George Mouzalon |
Osman I Köse Mihal | ||||||||
| Strength | |||||||||
| ~2,000[1] | ~5,000[1] | ||||||||
The Battle of Bapheus occurred on 27 July 1302, between an Ottoman army under Osman I and a 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 Ottomans.