Bel Air Manor is a colonial-era plantation manor located in Minnieville, Prince William County, Virginia. Built in 1740 as the Ewell family seat, the home was regularly visited by Thomas Jefferson and George Washington, who was a cousin. It later served as the home of Mason Locke Weems (1759–1825), the first biographer of George Washington and the creator of the cherry tree story. Extraordinarily well preserved for its age, Bel Air was added to the National Register of Historic Places in 1970. Today, Bel Air remains a private residence and an events venue. Bel Air is not to be confused with "Bel Aire", a similarly named house five miles to the east.