What do the Charlie Hebdo murders and the rise of the Islamic State owe to Islam? It would be comforting to insist, as many have done, that they owe nothing at all; but Holland, in the inaugural Christopher Hitchens Lecture, argues that the truth is more complex. The best way to combat jihadism, he proposes, is to recognise the centrality of Muhammad to Islam – and that he comes in many forms. There is the moral leader who swallowed abuse peaceably; and there is the war leader who ordered people who insulted him put to death. How best, then, to de-radicalise the Prophet? Tom Holland is author of In The Shadow of the Sword, Rubicon, Persian Fire, Millennium and the new translation of The Histories by Herodotus. Chaired by Katrin Bennhold of the New York Times.