The Romans had been at odds with the "Gauls" for a very long time. Somewhere between 390 and 386 BC, a Senoni warchief called Brennus managed to capture Rome and ransom the city with his famous Vae Victis. The Urbs was then a city whose authority was only relative. Nonetheless, the sack of Latium's capital, highlighted by Livy in his History of Rome, helped to forge a centuries-old loathing between the Romans, ashamed of being forced to capitulate to Brennus, and the Gauls, insolently proud of their triumph. The next step was part of the competition between the "Great Powers" of the period....