Battle of Mount Algidus
457 BCE.
Shown on the map at 41.723°, 12.769°.
The Battle of Mount Algidus was fought in 458 BC, between the Roman Republic and the Aequi, near Mount Algidus in Latium. The Roman dictator Lucius Quinctius Cincinnatus turned an expected Roman defeat into an important victory.
Text from the Wikipedia article Battle of Mount Algidus, licensed CC BY-SA 4.0.