Battle of the Lycus
65 BCE.
Shown on the map at 40.305°, 37.831°.
The Battle of the Lycus was fought in 66 BC between an army of Roman Republic under the command of Pompey the Great and the forces of Mithridates VI of Pontus. The Romans won the battle with few losses; their victory turned out to be decisive with Mithridates fleeing to the Kingdom of the Bosporus (north of the Black Sea) and committing suicide a few years later (in 63 BC), finally ending the Third Mithridatic War.
Text from the Wikipedia article Battle of the Lycus, licensed CC BY-SA 4.0.