Ilkhanate campaign to Bithynia
Part of the Byzantine-Ottoman wars. In these battles, Byzantium asked for help from the Ilkhanids and the Ilkhanids sent an army and defeated Ottoman Beylik.
| Bithynia Campaign (1308) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Part of the Byzantine–Ottoman wars | |||||||||
| |||||||||
| Belligerents | |||||||||
 Ilkhanate Byzantine Empire |
.svg){kind=small} Ottoman Beylik | ||||||||
| Commanders and leaders | |||||||||
| Unknown |
Osman I | ||||||||
| Strength | |||||||||
|
30.000 | Unknown | ||||||||
| Casualties and losses | |||||||||
| Unknown | Unknown | ||||||||
Campaign
changeIn 1302 Osman I of the Kayihan khanate heavily defeated the Romans and founded the Ottoman principality. In 1305, the Byzantine emperor Andronikus II asked Öljaitu for help in defeating the Ottoman Beylik. At the request of the Byzantine Emperor Andronicus II, Öljaitu promised to send him 40,000 of his troops. In 1308 Öljaitu sent 30,000 Ilkhanid soldiers to Bithynia to help Byzantium.[1][2] The Ilkhanid army recaptured Ottoman castles and towns in Bithynia and also crushed the detachment of Osman I.[3][4] But this brief intervention did not stop the Ottoman expansion.[5]