I research primarily the Goad family. 1 May 1784, Elizabeth Goasd married John Hammack in Pittsytlvania County, Virginia. Elizabeth was a daughter of William Goad, born 1734 in Richmond County, Virginia. Elizabeth was a first cousin to Gen/Gov John Sevier of Tennessee. Hre sister, Katherine, married Tandy Witcher 17 Dec 1772 and they went to Smith County, Tenn. Reuben and Joshua Goad of Smith County, Tenn. both married Witchers whose mother was a Dalton, all from Pittsylvania County.
Going back to Richmond County, we find that 11 July 1791 , a will was probated for William Hammack. He named a son William and a daughter Elizabeth and the executor was son Richard.
Part of Smith County, Tenn. became Mascon Counbty in 1842.