St. Augustine of Hippo, is one of the central figures in the history of Christianity, and this book is one of his greatest theological works. Written as an eloquent defense of the faith at a time when the Roman Empire was on the brink of collapse, it examines the ancient pagan religions of Rome, the arguments of the Greek philosophers and the revelations of the Bible. Pointing the way forward to a citizenship that transcends worldly politics and will last for eternity, this book is one of the most influential documents in the development of Christianity.