Thomas Cary Fairfax, 9th Lord Fairfax of Cameron

Thomas Fairfax, 9th Lord Fairfax of Cameron (1762–1846), son of Bryan Fairfax. Thomas Fairfax, with his father, on December 11, 1799, was among the last guests at Mount Vernon, before Washington died. He lived the life of a country squire overseeing his 40,000 acres (160 km2), lived at Belvoir, Ash Grove, and Vaucluse, where he died. He married three times: Mary Aylett, Laura Washington, Margeret Herbert. He had seven children: Albert Fairfax, Henry Fairfax, (who died in the Mexican–American War, at Saltillo, Mexico, on August 14, 1847), Orlando Fairfax, Reginald Fairfax, Eugenia Fairfax, Aurelia Fairfax, Monimia Fairfax, (mother of Constance Cary). He maintained a winter home at 607 Cameron Street, Alexandria, Virginia, which he built in 1816. Thomas Fairfax was a follower of Swedenborg. Because of these religious beliefs, he manumitted his slaves, taught them a trade, and sent them to Liberia. This is consistent with the thinking of the American Colonization Society. His grandson, Charles S. Fairfax, succeeded him as Baron Cameron.

Ash Grove is an 18th-century plantation house in Fairfax County, Virginia, United States. In 1790, Bryan Fairfax built Ash Grove on Leesburg Pike, 2 miles west of Tysons Corner, Virginia for his son, Thomas Fairfax.