Lucas Keith Thompson (1797–1866) was an Ohio lawyer, politician, educator and judge for more than 35 years, who died before he could assume a seat on the Court of Appeals.
He married his first wife, Susanna Caroline Tapscott (1802–1853), in Staunton, Augusta County, Virginia, on January 15, 1828.
[6] After finishing his education, and perhaps reading law with his elder brother James Powell Thompson (1792–1882, who moved to Tennessee), Thompson moved to Amherst County, Virginia, and practiced law, as well as served several terms in the Virginia House of Delegates, two alongside William M. Waller and later with Samuel M. Garland.
Voters of Albemarle, Amherst, Nelson, Fluvanna and Goochland counties elected Thompson as one of their four delegates to the Virginia Constitutional Convention of 1829–1830, alongside James Pleasants, William F. Gordon and Thomas Massie Jr.[7] Following that Constitution's ratification, the Virginia General Assembly elected Thompson as a county judge in Staunton, Virginia, and he succeeded Archibald Stuart in 1831.
His nephew John Lucas Thompson (1833–1866) captained Company C of the 16th Tennessee Infantry and barely survived the war.