The Mountain Meadows Massacre was a series of attacks during the Utah War that resulted in the mass murder of at least 120 members of the Baker–Fancher emigrant wagon train. The massacre occurred in the southern Utah Territory at Mountain Meadows, and was perpetrated by settlers from the Church of Jesus Christ of Latter-day Saints involved with the Utah Territorial Militia who recruited and were aided by some Southern Paiute Native Americans. The wagon train, made up mostly of families from Arkansas, was bound for California, traveling on the Old Spanish Trail that passed through the Territory.

Brigham Young was an American religious leader and politician. He was the second president of the Church of Jesus Christ of Latter-day Saints from 1847 until his death in 1877. During his time as church president, Young led his followers, the Mormon pioneers, west from Nauvoo, Illinois, to the Salt Lake Valley. He founded Salt Lake City and served as the first governor of the Utah Territory. Young also worked to establish the learning institutions that would later become the University of Utah and Brigham Young University. A polygamist, Young had at least 56 wives and 57 children. He formalized the prohibition of black men attaining priesthood, and led the church in the Utah War against the United States.