Confessions is an autobiographical work by Saint Augustine of Hippo, consisting of 13 books written in Latin between AD 397 and 400. The work outlines Saint Augustine's sinful youth and his conversion to Christianity. In the work, Augustine writes about how he regrets having led a sinful and immoral life. He discusses his regrets for following the Manichaean religion and believing in astrology. He writes about his friend Nebridius's role in helping to persuade him that astrology was not only incorrect but evil, and Saint Ambrose's role in his conversion to Christianity.