Who is Rulon T. from Under the Banner of Heaven: A Story of Violent Faith and what is their importance?

"Uncle Rulon" is the leader of the polygamous sects in Colorado City and Bountiful. He is believed to be the one mighty and strong as prophesied by Joseph Smith. Some people believed this prophet would live forever. Rulon took over control of the UEP in 1986, he died September 8, 2002. It was reported that he had 75 wives and at least 65 children. One of these children is Warren Jeffs who become leader in Colorado City and Bountiful when his father dies.