Ever since its occurence in 480 BC, the Battle of Thermopylae has been the stuff of legend. Echoes of this battle, reportedly fought between a seven thousand strong Greek army and a Persian force of anywhere between 100 thousand and one million, can be found dotted across the literature and history of Ancient Greece and Rome. Professor Chris Carey from University College London has written a book on Thermopylae and, in this episode, he tells us how its shadow continues to the present day, where the battle and its heroes are referenced by those fighting for freedom, as well as in films and video games.