Born: 1809-05-17 Christian County, Kentucky
Fagan moved to Springfield, Illinois, with his parents and siblings in 1820. In 1830, he married Mary Henry, with whom he had nine children. During the Black Hawk War, Fagan served as a corporal in Reuben Brown's company of the 4th Regiment of Mounted Volunteers. Mary Fagan died in 1858 and in 1860, John married Mary Williams in Logan County, Ohio. They owned a farm four miles north of Springfield.
John Carroll Power and S. A. Power, History of the Early Settlers of Sangamon County, Illinois (Springfield, IL: Edwin A. Wilson, 1876), 293-94; History of Sangamon County, Illinois (Chicago: Inter-State, 1881), 164; Ellen M. Whitney, comp., The Black Hawk War, 1831-1832: Illinois Volunteers, vol. 35 of Collections of the Illinois State Historical Library (Springfield: Illinois State Historical Library, 1970), 1:407.