Christianity, Crusades, Islam

"On September 11, 2001, there were only a few professional historians of the Crusades in America. I was the one who was not retired. As a result, my phone began ringing and didn’t stop for years. In the hundreds of interviews I have given since that terrible day, the most common question has been, “How did the Crusades lead to the terrorist attacks against the West today?” I always answered: “They did not. The Crusades were a medieval phenomenon with no connection to modern Islamist terrorism.”" (source)