John Messersmith md. 2nd) Nancy (O’Gullion) Flin on 10 Jun 1796 Wythe Co., VA. The marriage was of John Messersmith to Nancy Flin. The minister was Andrew Baker. (Wythe Co. Marriages compiled by John Vogt & T. William Kethley, Jr pg 79) Her maiden is Gullion or O'Gullion according to a lawsuit, Gullion vs Fulton dated 1799 in Wythe Co., VA. John Messersmith was 64 years old when he and Nancy were married.
Nancy (Agnes) O'Gullion was probably born abt 1750. She was probably 15 years younger than John the father of Godfrey, Peter, Andrew & Barnabas, Jr. It is not unreasonable for a woman to marry a man 15 years her senior.
https://www.familysearch.org/service/records/storage/das-mem/patron/v2/TH-904-54317-443-61/dist.txt?ctx=ArtCtxPublic