Proper noun
Fort Ancient
(historical) A Native American culture that flourished from c. 1000–1750 CE and predominantly inhabited land near the Ohio River valley in the areas of modern-day southern Ohio, northern Kentucky, southeastern Indiana, and western West Virginia.
Knepper (1989), p. 13. Researchers have identified two additional, distinct prehistoric cultures: the Fort Ancient people and the Whittlesey Focus people. Source: Internet
Some scholars believe that the Fort Ancient people "were ancestors of the historic Shawnee people, or that, at the very least, the historic Shawnees absorbed remnants of these older peoples." Source: Internet