Justin Martyr is the second of the great Christian figures of the second century. He is one of the earliest for whom we have a substantial biography from the man himself. He wrote at length and often, creating the largest body of Christian literature to his time. Later Christians quoted from him endlessly, and lauded him as a writer, apologist, philosopher, and intellectual. But he introduced a pronounced anti-Jewish animus into Christianity. He also creates the concept of "heresy", which would bedevil Christianity for centuries. I also discuss two of Justin's successors: Melito and Tatian.