High Quality Content by WIKIPEDIA articles! Parley Parker Pratt, Sr. (12 April 1807 – 13 May 1857) was a leader in the Latter Day Saint movement and an original member of Quorum of the Twelve Apostles from 1835 until his murder in 1857. He served in the Quorum with his younger brother, Orson Pratt. He was a missionary, poet, religious writer and longtime editor of the religious publication The Latter-day Saints` Millennial Star. Having explored, surveyed, built, and maintained the first road for public transportation there, scenic Parley`s Canyon in Salt Lake City, was named in his honor.