Abstract The Bennion family papers (1844-1949) include the diaries of John Bennion (1820-1877), Heber Bennion (1858-1932), and Mary Bennion Powell (born 1890), as well as family correspondence and autobiographical sketches. John and Samuel Bennion and John's son, Heber, were Utah sheep ranchers and polygamists, while Mary Bennion Powell was a daughter of Heber Bennion.