The Senones were one of the various Gallic tribes that had recently invaded northern Italy. They settled on the Adriatic Coast around what is now Rimini. According to Livy, they were called to the Etruscan town of Clusium (now Chiusi, Tuscany) by Aruns, an influential young man of the city who wanted to take revenge against Lucumo, who had "debauched his wife." When the Senones appeared, the Clusians felt threatened and asked Rome for help. The Romans sent the three sons of Marcus Fabius Ambustus, one of Rome's most powerful aristocrats, as ambassadors. They told the Gauls not to attack Clusium and that if they did, the Romans would fight to defend the town. They then asked to negotiate a peace. The Senones accepted a peace if the Clusians would give them some land. There was a quarrel and a battle broke out. The Roman ambassadors joined in. One of them killed a Senone chieftain. That was a violation of the rule that ambassadors had to be neutral. The brothers had taken sides and one of them had also killed a Senone. The Gauls withdrew to discuss what action to take.