Born: 1764 South Carolina
Died: 1845 Jasper County, Missouri
Flourished: 1826-1833 Sangamon County, Illinois
While living in South Carolina, Duncan served in both the Revolutionary War and the War of 1812. He married Sarah Whitmore, with whom he fathered thirteen children. Duncan moved to Sangamon County, Illinois, in either 1826 or 1827, and in 1833, he moved to Cave Springs, Missouri.
John Carroll Power and S. A. Power, History of the Early Settlers of Sangamon County, Illinois (Springfield, IL: Edwin A. Wilson, 1876), 270; History of Jasper County, Missouri (Des Moines: Mills, 1883), 680; Gravestone, Cave Spring Cemetery, Sarcoxie, MO.