As two of humanity's great religions, Islam and Christianity have shaped much of the world's history. Empires across the globe have risen and fallen under their influence, and there have been many occasions for them to go head-to-head on the battlefield. So what have been some of the greatest military clashes between Islam and Christianity? Dan is joined by Sir Simon Mayall, a former Middle East Senior Adviser at the UK Ministry of Defence, to discuss three key clashes; the Siege of Jerusalem in 1099, the Fall of Constantinople in 1453, and the Great Siege of Malta in 1565.

Produced by James Hickmann and edited by Dougal Patmore.

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