Who is Vercingetorix from The Conquest of Gaul and what is their importance?

Vercingetorix is a powerful Avernian prince whose father had ruled over much of Gaul. In 52 BC, despite the opposition of the leaders of the Avernians, he usurps their authority and quickly raises an army to attack the Romans. After a string of defeats at the hands of the Romans, Vercingetorix initiates a scorched earth policy, which severely hampers the Romans. At the siege of Avaricum, he displays his leadership and ability to rally his forces by persuading them to overcome their difficulties and press on with ingenious attacks on the Roman legions besieging the town. When Avaricum falls to Caesar, Vercingetorix inflicts very heavy losses on the Romans besieging the town of Gergovia. He avoids engaging with Caesar, but goes instead to the stronghold of Alesia.