There was a time when the Inca Empire ruled over more than 12 million people, carrying its influence from Colombia in the north to central Chile in the south. It's been nearly 500 years now since the Inca were conquered by the Spanish (in 1532).
The Inca society was a vertical hierarchical organization divided in four social classes. At the top of the stratum was the Sapa Inca, the most powerful person in the empire. Below was the royalty, comprised by the sons of the Sapa Inca and his close relatives.
Bonus answers for anyone
The farmers were also the largest and the most important class within the Inca Empire.
Cuzco was the center of the Incan empire. The Incas, an American Indian people, were originally a small tribe in the southern highlands of Peru.
The Inca Empire built a huge civilization in the Andes mountains of South America.