Robert Langdon: The Illuminati did not become violent until the 17th Century. Their name means 'The Enlightened Ones'. They were physicists, mathematicians, astronomers. In the 1500's they started meeting in secret, because they were concerned about the church's inaccurate teachings. They were dedicated to scientific truth. And the Vatican didn't like that. So the church began to, how did you say it? Oh, hunt them down and kill them.