Brigham Young. Pratt helped establish the refugee settlements and fields at both Garden Grove and Mt. Pisgah, Iowa. He personally led a pioneer company along the Mormon Trail to the Salt Lake Valley. Life in Utah In 1849, Pratt was appointed one of the justices of the anticipated state of Deseret. He later served in the legislature of the provisional state of Deseret beginning in 1849. During this same time, as one of the seven members of the Quorum of the Twelve in Utah, he was among those who oversaw the division of Salt Lake City into wards and the organization of other wards in Utah. Sometime in the mid-1850s, working with George D. Watt, Pratt helped develop the Deseret alphabet. In 1854, Pratt went to San Francisco, California, to preside over the LDS Church's Pacific Mission. In 1856, Pratt served as chaplain of the Utah Territorial Legislature. Death and legacy In 1856, Pratt went on a mission to the eastern United States. At that time, troubles were brewing in Pratt's life. Hector McLean was the estranged husband of one of Pratt's plural wives, Eleanor McLean. Pratt had met Eleanor in San Francisco, where he presided over a church mission. In San Francisco, Eleanor had joined the LDS Church and had also had her oldest sons baptized. Hector rejected Mormonism and opposed his wife's membership in the church. Though they did not divorce, the dispute led to the collapse of their marriage. Fearing that Eleanor would abscond to Utah Territory with their children, Hector sent his sons and daughter to New Orleans, Louisiana, to live with their maternal grandparents. Eleanor followed the children to New Orleans, where she lived with them for three months at her parents' house. Eventually, she and the children left for Utah Territory, via Texas; they arrived in Salt Lake City on September 11, 1855. She worked in Pratt's home as a schoolteacher. On November 14, 1855, she and Pratt underwent a celestial marriage sealing ceremony in the Endowment House. She was the twelfth woman to be sealed to Pratt. For religious and cultural reasons, Eleanor considered herself unmarried at the time of her sealing to Pratt, but she had not legally divorced from Hector. While Pratt was serving a mission in the eastern states, Eleanor went to New Orleans to get her children. Eleanor then took the children from her parents and headed to Texas.