The following data is extracted from A History of the Pioneer Families of Missouri - Warren County.
James Simpson was the owner of Simpson's Ferry on the Kentucky River. He had a son named Erasmus, who married Mary Bartlett, of Virginia, and they had Fortes B., Elizabeth, Thomas, James W., Martha, William H. H., John L., Mary, Julia, and Jeptha D. Fortes B. settled in Warren County in 1828. Elizabeth married William B. King, and they settled in St. Charles County in 1830. Martha married Sidney S. Wood, who settled in St. Charles County in 1835. Julia married Joseph I. Carter, and settled in St. Charles County in. 1836.
Source: A History of the Pioneer Families of Missouri - Warren County