This week Patrick explores the history of Istanbul from early times to the present day.  Guests on the panel include: Dr Kate Fleet, author of 'A Social History of Ottoman Istanbul', Dr Amy Mills, author of 'Streets of Memory: Landscape, Tolerance, and National Identity in Istanbul', Bettany Hughes, author of 'Istanbul: A Tale of Three Cities',  Dr Mehmet İpşirli from the Medipol University, Istanbul and Dr Chris Houston, author of 'Istanbul, City of the Fearless'.