Bahadır Gülle discusses the real meaning of Hagia Sophia's conversion back to a mosque by President Erdoğan within the framework of the historical background of the relation between state and religion in the Turkish republic. Bahadır Gülle is a former Turkish diplomat and a visiting scholar at the University of Cologne. He tweets at https://twitter.com/BahadGulle. * Narrated by: C. Tahir Şanlı (https://twitter.com/tahirsanli)