William Whitaker Taylor was a member of the Utah Territorial Legislature, member of the Presidency of the Seventy in the Church of Jesus Christ of Latter-day Saints, and a son of LDS Church president John Taylor. He was a half brother to John W. Taylor, a member of the Quorum of the Twelve Apostles who was dropped from the body and excommunicated for refusing to give up plural marriage, and a brother-in-law to George Q. Cannon.

Seventy is a priesthood office in the Melchizedek priesthood of the Church of Jesus Christ of Latter-day Saints. Traditionally, a church member holding this priesthood office is a "traveling minister" and an "especial witness" of Jesus Christ, charged with the mission of preaching the gospel to the entire world under the direction of the Twelve Apostles. The church teaches that the office of seventy was anciently conferred upon the seventy disciples mentioned in the Gospel of Luke 10:1-2. Multiple individuals holding the office of seventy are referred to collectively as seventies.