Roman province until 27 BC, and resistance would continue until as late as 70 AD. There is no clear end-date for the war, but the imminent Roman Civil War led to the withdrawal of Caesar's troops in 50 BC. Caesar's wild successes in the war had made him extremely wealthy and provided a legendary reputation. The Gallic Wars were a key factor in Caesar's ability to win the Civil War and declare himself dictator, in what would eventually lead to the end of the Roman Republic and the establishment of the Roman Empire. Motifs and peoples in the De Bello Gallico Leaders of the Gallic tribes In the Commentarii de Bello Gallico, Caesar mentions several leaders of the Gallic tribes. Among these, Diviciacus and Vercingetorix are notable for their contributions to the Gauls during war. Diviciacus Book 1 and Book 6 detail the importance of Diviciacus, a leader of the Haedui (Aedui), which lies mainly in the friendly relationship between Caesar and Diviciacus ("the one person in whom Caesar had absolute confidence") (I, 41). His brother, Dumnorix had committed several acts against the Romans because he wanted to become king and (I, 41); thus Caesar was able to make his alliance with Diviciacus even stronger by sparing Dumnorix from punishment while also forcing Diviciacus to control his own brother. Diviciacus had, in tears, begged Caesar to spare the life of his brother, and Caesar saw an opportunity to not only fix his major problem with Dumnorix, but also to strengthen the relationship between Rome and one of its small allies. Another major action taken by Diviciacus was his imploring of Caesar to take action against the Germans and their leader, Ariovistus. His fear of Ariovistus and the general outcry from the Gallic people led Caesar to launch a campaign against the Germans, even though they had been considered friends of the Republic. Vercingetorix Vercingetorix, leader of the Arverni, united the Gallic tribes against Caesar during the winter of 53–52 BC. This appears in Book VII, chapters 1–13. Vercingetorix's father, Celtillus, was killed after attempting to seize power amongst the Arverni; for that reason, Vercingetorix was a social outcast and had much to gain from a rebellion. When it was clear that Caesar had defeated the Gallic rebellion, Vercingetorix offered to sacrifice himself, and put himself at the mercy of Caesar, in order to ensure that his kinsmen were spared. After