2,499 years ago one of the most famous battles in antiquity, indeed one of the most famous battles in history, was fought at the Pass of Thermopylae in central Greece. King Leonidas, his 300 (or so) Spartans and their Hellenic allies fought off against King Xerxes' mighty Persian army for three days. To talk through this fascinating battle I'm chatting with Paul Cartledge, a professor from the University of Cambridge and one of the World's leading experts on ancient Sparta. In this fascinating chat, Paul sorts the fact from the fiction about this iconic clash.