Shortly before this boy's birth, his father Thomson Mason inherited a portion of the
Gunston Hall estate, which his father George Mason and previous generations of the family had farmed using enslaved labor. George Mason had died on October 7, 1792, after training his three eldest sons including Thomson Mason (who shared the name with his lawyer uncle, who died before his brother) to operate using enslaved labor even before they reached reaching legal age to hold property. However, in his final years, the elder Mason trained his two youngest sons, John Mason and Thomas Mason to become merchants, but they too became wealthy planters after the Fairfax County court admitted a 1775 will into probate when this man was a boy. Around 1817, as R.C. Mason reached legal age, Thomson Mason divided his Fairfax County property into two plantations: By 1819, R.C. Mason and his family also owned property in the southern section of Alexandria known as Round Hill. During the 1820s, Fairfax County voters twice elected (but failed to re-elect) Dr. R.C. Mason as one of their delegates in the
Virginia House of Delegates (a part-time position). He served one term alongside his distant lawyer cousin
Robert Townshend Thompson and one term alongside Nathaniel Tyler. While practicing medicine in Alexandria (before retiring at age 45), His brother Thomson F. Mason served on the Alexandria City council in the 1820s and 1830s, and as the town's mayor 1828–1830. In 1824, Hollin Hall burned down and was not immediately rebuilt. During the 1830s R.C. Mason began building a new manor house on his Dogue Run plantation, where he began living by 1834 and called
Okeley Manor. In that year, he owned 17 slaves in Fairfax County, ranging from a 48 year old Black man and his 45 year old mulatto wife to 7 year old black and 6 year old mulatto boys and 6 and 4 year old mulatto girls. A decade later, the census district was renamed for the
Orange and Alexandria Railroad which ran through it, and R.C. Mason owned ten slaves, the oldest a 31-year-old woman. Shortly after Virginia voted to secede from the Union at the beginning of the
American Civil War, Union troops occupied Alexandria and commandeered Mason's house because of its proximity to the strategically important railroad which connected the town to the state capitol at
Richmond. Dr. Mason moved his family to Richmond, but alternate stories exist as to his wartime activities. His pardon application in 1865 said he was a writer in General Cooper's office. However a record exists of his 1861 enlistment in the
Confederate States Army, and on October 1, 1861, Sergeant R.C. Mason was assigned as a medic at Culpeper Court House. Moreover, his sons
Beverly Randolph Mason and
Thomas Pinckney Mason served as Confederate officers (army and naval respectively) during the conflict. Following the conflict, R.C. Mason returned home at age 72 to find the mansion at Okeley had been used during the war as a hospital (particularly for infectious smallpox patients), then burned to the ground. ==Death and legacy==