Battle of the Allia and plunder of Rome by Gauls

(390 BCE)

Battle of the Alia River, fought in 390 BCE (according to the Roman calendar) or 387/6 BCE (according to the Greek calendar), between the Romans and Senones (one of the Gallic tribes), ended in the humiliating defeat of the Roman army. Consequently, a few days after the battle, the Gauls occupied Rome, which they plundered completely.