 Ann Thomson Mason chose Chopawamsic as her dower after her husband's death and managed Mason family interests from the estate for the remainder of her life.George Mason IV spent his early adolescence and began his early education at Chopawamsic and resided there until the age of 24 when he moved to present-day Fairfax County.Stevens Thomson Mason, son of Thomson Mason, who was first Attorney of the Bar in Dumfries, was born at Chopawamsic in 1760.