Istanbul 2013-05-15 The author of numerous bestselling novels Dan Brown describes Istanbul as "a dimidiate world" and "a city of opposed forces" in his new novel Inferno. Brown also describes Hagia Sophia, which is constructed as a church between 532 and 537 on the orders of the Byzantine Emperor Justinian and in 1453 converted into a mosque by the order of Sultan of the Ottoman Empire Mehmed II, as The extant building which is the region's most precious jewel. General view of Hagia Sophia in Istanbul, Turkey. Burak Akbulut / Anadolu Agency Photo: Burak Akbulut / AA / SCANPIX kod 10611 ***FRANCE OUT*** ***BETALBILD***