The Inca, who called themselves the Tawantinsuyu – ruled an empire extending from Ecuador to central Chile, their capital was called Cuzco/Cosco. The Inca were a Peruvian highland warrior people. The king of the Inca Empire was called the Sapa Inca (emperor), or simply Inca.
The race of the Inca, as well as the Holy Roman Emperors, who later came to rule them during the reign of Charles V, has long been in contention. Two old paintings with provenance in Peru, answers both questions definitively.