Battle of Verona
249 CE.
Shown on the map at 45.426°, 10.992°.
The Battle of Verona was fought between the Roman general and usurper Decius, and emperor Philip the Arab in 249. Decius was victorious and Philip and his son Philip II were both killed. Decius was subsequently declared Roman emperor.
Text from the Wikipedia article Battle of Verona (249), licensed CC BY-SA 4.0.