John HAVIN (or HAVENS Sr.), was born between 1700 and 1706. Records indicate he was from New Kent County, Maryland and moved to Augusta County, Virginia where he received a patent for land in Southwest Virginia in 1762. He first married Elizabeth F'eteplace on August 19, 1727, in Ann Arundel County, Maryland. They lived in Kent County, Maryland from 1731-1741 where he was Deputy Clerk of Court and Schoolmaster. He was Schoolmaster during 1747-1757 in Baltimore County, Maryland, during which time (after 1754) his wife Elizabeth died. John married Sarah O'Brian (or O'Bryan) Widow of Cornelius O'Brian (or O'Bryan) of Augusta County, Virginia 
He is next recorded as Schoolmaster (1770-1784) in Botetourt, County, Virginia. John Havens died August 1784 in Botetourt County, Virginia. Descending from John was a James Havens who was born in 1728. He lived in Frederick County, Maryland during 1759-1764, in Bedford County, Virginia during 1769-1772, in Montgomery County, Virginia in 1782 and on Bluestone River in Tazewell County, Virginia about 1800. James served in Dunmore's War in 1774 (Captain Burk's Company) but refused to take an Oath of allegiance. They were noted as ringleaders of the Tories in the area. He died before 1816.
https://www.wikitree.com/wiki/Heavin-3
- Conflict: the wife named in the will of Cornelius Bryan (O'Brien of Augusta County, Virginia was named "Rebecca", not Sarah. Additional research is needed.
