The Jefferson-Lemen Compact The Relations of Thomas Jefferson and James Lemen in the Exclusion of Slavery from Illinois and Northern Territory with Related Documents 1781-1818

James Lemen arrived on the Illinois frontier with a soldier’s grit and a revolutionary’s pedigree, his life shaped by a brief but intense service under Washington and a marriage into the prominent Ogle family. Though born near Harper’s Ferry, his ambitions stretched far west, where he helped found the settlement of New Design and took on roles as justice of the peace and county judge. Through a youthful mentorship with Thomas Jefferson, Lemen absorbed ideas that would later drive his public career and his growing influence among the fledgling community.

Guided by those Jeffersonian ideals, Lemen became a leading voice against the spread of slavery into the Northwest Territory, helping to lay the groundwork for Illinois’s 1818 free‑state constitution. Simultaneously, he championed the Baptist faith, establishing the first congregation in the region and fostering a family of preachers who spread its message across the new state. Listeners will hear how one man’s dedication to liberty and religion helped shape the moral and civic character of early Illinois.