In 615, the Roman Empire was on its knees. The Persians had conquered most of Syria and the Levant and were poised to invade Egypt, the empire's richest province. But from the ashes of defeat would arise a new army, led by the emperor Heraclius, determined to avenge the fall of Jerusalem. Centuries later, they would be called the First Crusaders.

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Find my latest book, Justinian's Empire, on Amazon.com and Amazon.co.uk. For German listeners, find the German translation of the first book in my series on the 'Fall of the Roman Empire', Die römische Revolution, on Amazon.de. Finally check out my new YouTube videos on the fall of the Roman Empire.