Siege of Aquileia
238 CE.
Shown on the map at 45.767°, 13.367°.
The siege of Aquileia was a siege battle that took place in 238 in the town of Aquileia during the Year of the Six Emperors, which resulted in the assassination of Maximinus Thrax.
Text from the Wikipedia article Siege of Aquileia, licensed CC BY-SA 4.0.