[139] All quotations and sources not otherwise identified in this section are from John Mercer's letter to George, December 22, 1767-January 28, 1768. _The George Mercer Papers_, op. cit. (footnote 51), pp. 186-220. [140] Grandfather of President James Monroe. "Tyler-Monroe-Grayson-Botts," _Tyler's Quarterly Historical Genealogical Magazine_ (Richmond, 1924), vol. 5, p. 252.