In Early Christian Apologetics , D.H. Williams offers a comprehensive presentation of Christian apologetic literature from the second to the fifth century, considering each writer within the intellectual context of the day. Williams argues that most apologies were not directed at a pagan readership. In most cases, he says, ancient apologetics had a double object: to instruct the Christian and to persuade weak Christians or non-Christians who were sympathetic to Christian claims. Traditionally, scholars of apologetics have focused on the context of persecution in the pre-Constantinian period. By following the links in the intellectual trajectory up though the early fifth century, Williams prompts deeper reflection on the process of Christian self-definition in late antiquity. Taken cumulatively, he finds, apologetic literature was in fact integral to the formation of the Christian identity in the Roman world.