What is the theme in Augustine of Hippo: A Biography, by Peter Brown by Peter Brown?

The main theme surrounds pagans and Christians. The situation for the world at the beginning of the biography of Augustine is that forms of paganism, often polytheistic religions are still prevalent throughout the region of the Mediterranean Sea. Christianity has come along as a very altered form of Judaism which, amongst other things offers this one God. During Augustine's life, the dominant political force in the society in which he lived actually changed over from localized types of paganism into Christianity.