Avaricum was an oppidum in ancient Gaul, near what is now the city of Bourges. Avaricum, situated in the lands of the Bituriges, was the largest and best-fortified town within their territory, situated on very fertile lands. The terrain favored the oppidum, as it was flanked by a river and marshland, with only a single narrow entrance.By the time of the Roman conquest in 52 BC the city according to Julius Caesar had a population of 40,000 people.