 Complete the following phrase:  George Mason IV, an active patriot and mentor of his neighbor General then President George Washington subdivided his property when his firstborn son George Mason V 1753-1796 reached legal age in 1774 a year after his mothers death. The house was actually built beginning circa 1784, a year after that somewhat sickly son returned from a European trip taken for health and business reasons, and shortly before the sons marriage to Elizabeth Barnes Hooe, whose father operated the Barnesfield plantation in nearby King George County. Lexingtons construction of wood rather than brick or stone like Gunston Hall, may indicate the economic constraints imposed by the American Revolutionary War upon the patriot family. Although they had six children and documents confirm at least three were born at this plantation house, George Mason V would only acquire title to the plantation upon his fathers death in 1792 when the Fairfax County Circuit Court accepted and transcribed his fathers lengthy and codicil-free will written in 1773 and named him the estates executor and only survived his father by four years. The name commemorates the 