 Among the various cultures was the Caddoan Mississippian culture, which developed by 1000CE and occupied certain sites in Arkansas at different times.This was the westernmost expression of the Mississippian culture, which developed a vast network and numerous centers of development throughout the Mississippi Valley and its tributaries.The Caddoans constructed substantial earthwork mounds in the areas of Arkansas and Texas; the largest in Arkansas is Battle Mound Site, built from 1200-1400 CE in what is present-day Lafayette County.