Why did the medieval Abbasid Caliphs have almost all ancient Greek works of philosophy and science translated into Arabic? How did the long list of medieval Muslim polymaths reconcile abstract reasoning with Islamic doctrine?

Who were the radical freethinkers that rejected revealed religion in favor of reason in a society where apostasy and heresy were punishable by death?

And why are developments in the 11th century crucial to understanding modern controversies over blasphemy and apostasy, such as the Salman Rushdie affair and the attack on Charlie Hebdo?   

Find out in episode 5 of Clear and Present Danger – A History of Free Speech: The Caliphate.

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