How did the great divide within Islam, the split between Sunni and Shia, develop? We trace how the great 16th century confrontation between the Ottomans of Turkey and the Safavids of Iran cemented what had previously been a much more porous division. Iran has been a Shia country ever since and this has shaped much of the modern Middle-East. Listen as William and Anita are joined by Barnaby Rogerson to discuss one of the crucial turning points of Persian history.

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Twitter: @Empirepoduk

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Producer: Callum Hill

Exec Producer: Neil Fearn

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