Inca, Group of South American Indians who ruled an empire that extended along the Pacific coast and Andes Mountains from what is now northern Ecuador to central Chile. According to tradition (the Inca left no written records), the founder of the Incan dynasty led the tribe to Cuzco, which became their capital. Under the fourth emperor, they began to expand, and under the eighth they began a program of permanent conquest by establishing garrisons among the conquered peoples.
