Rulon Timpson Jeffs, known to followers as Uncle Rulon, was an American polygamist and religious leader who served as the president of the Fundamentalist Church of Jesus Christ of Latter-Day Saints, a Mormon fundamentalist organization based in Colorado City, Arizona, United States, from 1986 until his death in 2002. He was the father of later FLDS Church leader and convicted felon Warren Jeffs.

Leroy Sunderland Johnson, known as Uncle Roy, was a leader of the Mormon fundamentalist group in Short Creek, which later evolved into the Fundamentalist Church of Jesus Christ of Latter-Day Saints, from the mid-1950s until his death.