James M. Kirby, born December 1, 1830, in Kentucky, was a notable farmer and stock-raiser in Morgan Township, Dade County, Missouri. He was the son of Tully C. and Nancy (Hernington) Kirby and the fourth of eleven children. At nineteen, Kirby enlisted in the Mexican War, serving in the Third Regiment Mounted Infantry of Missouri. During the Civil War, he joined the Home Guards and later the Enrolled Militia, eventually becoming captain of Company E, Seventy-sixth Regiment. In 1850, he married Mary J. Grisham, with whom he had twelve children. A Republican, Kirby owned 370 acres of land and was active in local politics and the Masonic Lodge. He and his wife were members of the Baptist Church.