This is the fifth volume in a series of biographical histories on conflicts between Islam and Christianity throughout Western history. Mr. Reston focuses this book on the battles between Holy Roman Emperor Charles V and Turkish Sultan Suleyman the Magnificent, leading to the attempted siege on Vienna by the Ottoman Empire. From the first ever Gaithersburg Book Festival, Mr. Reston talked about the process of historical writing and the implications of this history on modern day conflicts between the West and the Islamic world.