Facts and Events
From:Source:Woods,1901 "History of Albemarle County, Virginia", by Rev. Edgar Woods, pub. 1901, pg. 363:
DAVID GASS - Capt. David Gass was born in Pennsylvania in 1729. He settled early in Albemarle Co., Va., where he was serving in the militia in 1758. In 1769 he moved to Castlewood and prepared to go with Boone to Kentucky in 1773. After the Indians attacked Boone's party in Powell Valley, Boone came to Castlewood and lived in a cabin on Capt. Gass's land until he moved to Boonesboro in 1775. Capt. Gass made seven trips to Kentucky before finally moving his family there in 1777. Gass sold his home place on the Clinch to his brother-in-law, Capt. William Cowan, who in turn sold it to James Osborne, Gass died in Madison Co., Ky."
There are indications that David Gass was a brotherinlaw to the Moore family. That might indicate that his wife's last name was "Moore". This might also mean that one of the Moore's, for example might have married a brother or sister of David Gass, which would give no indication of the last name of David's wife.
From Chalkley's Augusta County Records:
Volume II, Page 283, Shane, John D. Interview with John Gass, near Paris, KY. Data concerning his father, David Gass
David Gass is listed in the Albemarle County Militia in September 1758. Among the others listed is a John Cowan.