Emperor Heraclius took the Byzantine Empire from its lowest ebb to its greatest heights. After years of turmoil at the hands of invading Persian armies, Heraclius led lightning counter-offensives that swept into Mesopotamia and devastated the Sassanid Empire. His battlefield exploits became the stuff of legend, but his success was not to last - in the Arabian Peninsula, a new religion was on the rise that would mark the end of one era and the beginning of another.

Jonathan Harris, Professor of the History of Byzantium at Royal Holloway, explains how Heraclius reinstated the empire as a regional superpower, and why the rise of the Arab Muslims brought it all tumbling down.

Produced by Mariana Des Forges and James Hickmann and edited by Max Carrey.

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