'The Sultan at the Mosque of St Sophia', Constantinople, Turkey, 19th century. [Getty Images]

'The Sultan at the Mosque of St Sophia', Constantinople, Turkey, 19th century. Hagia Sophia, also known as the Church of the Holy Wisdom, is the most famous Byzantine structure in Constantinople (now Istanbul). Built between 532 and 537 AD by Emperor Justinian I, it was a mosque for a time, and is now a museum. (Photo by The Print Collector/Print Collector/Getty Images)

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