Fairfax family.

In 1649, the then exiled King Charles II gave the Northern Neck, the area between the Potomac and Rappahannock Rivers to seven of his supporters. Thomas Fairfax, 6th Baron of Cameron (1693-1781) inherited the Northern Neck in 1710. His dispute with Virginia over the boundaries of his grant was settled in his favor in 1745. The state of Virginia canceled the proprietorship in 1785. The family finally sold their last interest in the estate in 1808.

From the description of Brock Collection: Fairfax Proprietary papers, 1675-1843. (Huntington Library, Art Collections & Botanical Gardens). WorldCat record id: 228721080