In this programme Boris Johnson also looks at the Sack of Constantinople, when Latin Christians fought eastern Christians, leading eventually to the fall of the city to the Ottoman Turks in 1453. He looks too at the Reconquista in Spain, which culminated in the wholesale expulsion of Jews and Muslims. At every turn of his journey, Boris Johnson finds that the real history is a good deal more subtle and interesting than the fictions that have grown up around it.