Marshall County, named in honor of the young nation's first Supreme Court Chief Justice and noted American jurist, John Marshall, was established by an act of the Tennessee General Assembly in 1836. The act which created the county specified that the county seat be named Lewisburg to commemorate the deeds of frontier explorer Meriweather Lewis. He had been leader of the Lewis and Clark Expedition to explore the Louisiana Territory soon after its purchase. Lewisburg was incorporated in 1837, on a site of donated for civic purpose.