James Proctor Knott was a U.S. Representative from Kentucky and served as the 29th Governor of Kentucky from 1883 to 1887. Born in Kentucky, he moved to Missouri in 1850 and began his political career there. He served as Missouri Attorney General from 1859 to 1861, when he resigned rather than swear an oath of allegiance to the federal government just prior to the outbreak of the Civil War.

The Office of the Missouri Attorney General was created in 1806 when Missouri was part of the Louisiana Territory. Missouri's first Constitution in 1820 provided for an appointed attorney general, but since the 1865 Constitution, the Attorney General has been elected. As of January 2023, there have been 44 attorneys general in Missouri.