Also associated with Rev. Williamson was this: Turkey Run, Fauquier County, Virginia ca. 1778 In the eastern foothills of the Blue Ridge, between Culpeper and Loudoun and west of Prince William settlement began about 1712, but was sparce. Warrenton, the county seat, was not incorporated until 1810, and the original location on land of Richard Henry Lee contained only twelve lots. In 1773, after Rev. William Thom was settled at Alexandria and the Rev. Amos Thompson at Leesburg, mission work was begun by these two men in Fauquier County which crystallized in 1778 in the appearance of Turkey Run as a place for Presbyterian worship. That year it made supplication by name not only for ministers, Mr. Thompson having gone to the wars, but especially for a man to care for a Latin school. That year appointments were made for Turnkey Run in connection with Kittocktin and Gum Spring: Hezekiah James Balch and John McMillan in the spring, John Slemons, Robert Cooper and Samuel Waugh in the fall, the latter into the next year. Thereafter Turkey Run disappears; only on April 3, 1787, the Presbytery of Hanover appointed Rev. James Waddell to preach two Sundays in Fauquier County, the Presbytery of Donegal having been divided and jurisdictions in a state of transition. Probably the Presbyterians conducted services in the Episcopal church by that same name about a mile or so from Warrenton, Virginia. Dr. Graham, an historian of the area, supposed that the present Warrenton Church grew out of the service conducted at "Turkey Run in Fauquier County." History is that the Warrenton Church was established on April 13, 1827 by division of the Middleburg congregation gathered and organized by the Rev. William Williamson.