Grand Canyon has been lived in for tens of centuries by ancestors of several of the historic tribes of Arizona, including the Havasupai, Hualapai, Southern Paiute and Hopi. From rock art sites to seasonal camps and roasting pits; and from mysterious split-twig figurines found in remote caves to visible ruins and small cliff dwellings, evidence of their long history in the canyon abounds. We will discuss this earliest human occupation of Grand Canyon and the prehistory of each of these tribes.