 But who was this man that became known as the friend of the Mormons? Cain has long been known as a friend of the Mormons. He was known as that during his own lifetime. And it's well deserved. Through his lobbying, through his political efforts, through his writing on behalf of the Mormons, through his advising of them for almost four decades, he becomes the most important non-Mormon in Latter-day Saint history. Next week on History of the Saints,