In this episode we turn east to consider Byzantium. We last spoke about the eastern Romans, or the Byzantines, in episode 113 when I described the emperor Leo III’s victory in the winter of 717/718 over an immense Umayyad army and navy intent on taking Constantinople. This was a pivotal moment in history. Few people at the time would have expected Byzantium to survive. But it did. And the Umayyad Caliphate’s advance into Europe was blocked. 

But before we move on to the rest of Leo’s reign, the question I want to ask in this episode, is how did Byzantium do it? How was it able to fend off Islam, by far the greatest power of its age? 

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