Battle of the River Amnias
88 BCE.
Shown on the map at 40.424°, 34.136°.
The Battle of the River Amnias was fought in 89 BC between Mithradates VI of Pontus and Nicomedes IV of Bithynia during the First Mithridatic War. The forces of Pontus were commanded by Archelaus and Neoptolemus, while the Bithynians were led by King Nicomedes himself. Pontus was victorious. This battle and subsequent events would lead to the loss of Roman rule in the province of Asia for some years.
Text from the Wikipedia article Battle of the River Amnias, licensed CC BY-SA 4.0.