This episode is brought to you by Secret Societies, a Parcast Original. For more episodes like this one, subscribe to Secret Societies, free on Spotify.  Throughout the history of Islam, schisms led to the formation of different branches or sects. In 1090, after the death of an Imam, a missionary set out to form his own branch of Islam. In the process, he would create one of the deadliest secret societies in history. Learn more about your ad choices. Visit megaphone.fm/adchoices