Before it became known as Mount Rushmore, the Lakota called this granite formation Tunkasila Sakpe Paha, or Six Grandfathers Mountain. It was a place for prayer and devotion for the Native people of the Great Plains, explains Donovin Sprague, head of the history department at Sheridan College in Wyoming and a member of the Cheyenne River Sioux Tribe. The mountain’s location in the Black Hills was also significant. “It’s the center of the universe of our people,” Sprague says. For Lakota, Cheyenne, and Arapaho communities, the region was not only spiritually important, it was also where tribes gathered food and plants they used in building and medicine.