Taoping Castle

On the side of the road near where Greenbelt Road crosses the Beltway is this historical marker sign denoting the Taoping Castle (circa 1750). It is on Walker Road. It reads:
On this site, Isaac Charles and Nathan Walker erected a large white oak log house named for their ancestral stronghold in Scotland which the three brothers had fled after the failure of attempts to unseat George I, King of England, as ruler of Scotland. Isaac permanently settled here and obtained land grants for 188 acres. He and his three sons served in the Revolutionary War. The graves of Isaac and his son Nathan are north of here.
Taoping Castle was the birthplace of Samuel Hamilton Walker (February 24, 1817 — October 9, 1847). Lt. Colonel of the Texas Rangers and Captain of the US Cavalry, he left home at age 19 to fight Indians and later became a leader and hero of the Rangers. His suggested changes to Samuel Colt’s revolver resulted in Colt’s success as an arms manufacturer. 1000 Colt-​Walker pistols — the first, heaviest and longest revolvers ever issued to American forces — were purchased for the Texas Rangers during the Mexican war. Walker was killed in that war at the Battle of Hua Mantla, Mexico.
The family cemetery is all that remains of the Taoping Castle estate.