A Rigdonite is a member of the Latter Day Saint movement who accepts Sidney Rigdon as the successor in the church presidency to the movement's founder, Joseph Smith Jr. The early history of the Rigdonite movement is shared with the history of the Latter Day Saint movement, but as of the 1844 succession crisis becomes distinct. Sidney Rigdon and other church leaders, including Brigham Young and James J. Strang, presented themselves as leaders of the movement and established rival church organizations. Rigdon's group was initially headquartered in Pittsburgh, Pennsylvania. It was known at one point as the Church of Jesus Christ of the Children of Zion, and its adherents are referred to as Rigdonites, or sometimes "Pennsylvania Latter Day Saints" or "Pennsylvania Mormons." The only surviving organization that traces its succession back to Rigdon's organizations is The Church of Jesus Christ, founded by a group of Rigdon's followers led by William Bickerton.