You probably don't know what that is. Google it. Mr. Green, Mr. Green, why do you think people know so little about Islamic history? Did you just ask an interesting, non-annoying question me from the past? I think we don't know much about early Islamic history because we don't learn about it, because we're taught that our history is the story of Christianity in Europe, when in fact, our history is the story of people on the planet. So let's try to learn something today. So in less than 200 years, Islam went from not existing to being the religious and political organizing principle of one of the largest empires in the world.