What tribe was the first to conquer the city of Rome?

The first tribe to conquer the city of Rome was the Gauls, specifically the Senones tribe, led by their chieftain Brennus. They invaded and sacked Rome in 390 BC during the Gallic Wars, causing significant destruction and panic among the Roman population. This event marked a pivotal moment in Roman history, highlighting the vulnerabilities of the early Republic and leading to military reforms. The Romans eventually recovered and rebuilt, laying the foundation for their future expansion and dominance.