New series 1/3. What if we could eavesdrop on some of history's titanic clashes of personalities and ideas? Allan Little acts as moderator as today's leading theologians and historians argue on behalf of their historical counterparts. The first programme revisits the controversy between St Augustine of Hippo and the British "heretic" Pelagius over Original Sin and raises questions about human nature, free will and the source of good and evil.
Producer Kirsten Dwight Repeated on Saturday at 10.15pm