It's been four hundred years since the death of William Shakespeare, and the Bard is as popular as ever... and just as mysterious. For centuries, a war has raged over the question: who is Shakespeare? We explore how the answer has evolved through the ages, and what that tells us about our changing perceptions of class, art, genius, and religion. Plus, a look at Shakespeare's enduring global relevance, with an inspiring and perilous performance of Love's Labor's Lost in Afghanistan.