John Theodorus Walker (February 13, 1744December 2, 1809) was a lawyer, planter, military officer and U.S. senator from Virginia.

Early life Walker was born in "Castle Hill" plantation in Albemarle County, Virginia, the son of Dr. Thomas Walker. He received private education before attending the College of William and Mary, from which he graduated in 1764. He was a neighbor and classmate at William and Mary of Thomas Jefferson, and they remained close friends until the elections of 1804-1805. In 1768, he was elected to the American Society.Bell, Whitfield J., and Charles Greifenstein, Jr. Patriot-Improvers: Biographical Sketches of Members of the American Philosophical Society. 3 vols. Philadelphia: American Philosophical Society, 1997, 2:251–255.

Military and political service While still student at William & Mary or shortly after graduation, Walker accompanied his father to Fort Pitt to make a treaty with Native American tribes.The Treaty of Fort Pitt in 1778 was the fourth treaty made in that location, but Dorman vol.1, p. 293 does not specify which of the preceding treaties this was In 1772, Albemarle County voters elected him to replace his father as a one of their representatives to the House of Burgesses, future governor and President Thomas Jefferson being the other part-time delegate; both were re-elected and served until that Governor Lord Dunmore suspended the body as the American Revolutionary War began.Cynthia Miller Leonard, The Virginia General Assembly 1619-1978 (Richmond: Virginia State Library 1978) pp. 102, 105 Walker also represented alongside Jefferson in the first four of the Virginia Revolutionary Conventions, with Charles Lewis also becoming a delegate in the Fourth Convention and replacing this man in the Fifth Convention as George Gilmer replaced Jefferson.Leonard pp. 109, 112, 114, 117

Unlike Jefferson, Walker served in the Continental Army, including in 1777 as an aide-de-camp to General George Washington, holding the rank of colonel.

In 1780, Virginia legislators elected Walker as a delegate to the Continental Congress. In 1782, Albemarle County voters elected him to his last term in the House of Delegates, where he again served alongside Jefferson.Leonard p. 145

At some point, Walker studied law, was admitted to the Virginia bar and served for many years as Commonwealth Attorney (prosecutor) for Albemarle County.John Frederick Dorman, Adventures of Purse and Person (Order of First Families of Virginia, 2004) vol. 1 p. 292 When William Grayson died in 1790, Virginia's governor appointed Walker as his replacement in the United States Senate, where he served from March 31 to November 9 of that year, when fellow Revolutionary War veteran and future president James Monroe was elected by the Virginia General Assembly.

Walker was an elected member of the American Philosophical Society.

Walker owned several plantations, including "Belvoir" in Albemarle County, which he (like his father) operated using enslaved labor, which was not uncommon in this era. In the 1787 Virginia tax census, his father owned 37 slaves under 16 years old, 38 adult slaves, 25 horses and 81 cattle, as well as a four wheeled chariot, and this man owned 26 slaves under 16 years old, 21 adult slaves, 17 horses, 3 cattle and a four wheeled chariot Netti Shreiner-Yantis and Florene Speakman Love, The 1787 Censs of Virginia (springfield, Genealogical Books in Print, 1987) p. 145

Personal life Walker married Elizabeth Moore, the daughter of Bernard Moore. They had a daughter Mildred, who married Francis Kinloch (1765-1826) who had graduated from Eton College and studied in Paris and Geneva before serving in the Revolutionary War and earning promotion to captain and serving many terms in the South Carolina House of Representatives as well as in the Continental Congress, the South Carolina ratification convention, and as warden of the city of CharlestonDorman, vol.1 pp.292-293

Thomas Jefferson's attempted seduction of this man's wife, which almost led to a duel, and was fodder for the Federalist Press.

Death and legacy Walker died in 1809.

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