The land on which Rappahannock County is sited was owned in the early 1700s by Thomas Fairfax 6th Lord Fairfax. It was part of the Northern Neck Proprietary, which consisted of 5.3 million acres of land located between the Rappahannock River and the Potomac River, from their headwaters in the Blue Ridge mountains to the Chesapeake Bay. In 1649 King Charles II of England, then in exile in France after the execution of his father, Charles I, had given this unmapped and unsettled region to seven loyal supporters. By 1688 the proprietary was owned solely by Thomas Lord Culpeper whose only child married Thomas 5th Lord Fairfax in 1690. They acquired the proprietary on the death of Lord Culpeper, and the region became synonymous with the Fairfax name. In 1719, Thomas Fairfax 6th Lord Fairfax inherited the land.