Topa Inca Yupanqui returned to Cuzco, secure in the knowledge that Inca power could not be challenged. The rapid expansion of the empire, however, created a number of problems concerned with sustaining themselves and governing a large number of diverse ethnic groups. Pachacuti Inca Yupanqui and Topa Inca Yupanqui were imaginative and made several important innovations in Inca institutions.
Pachacuti Inca Yupanqui began rebuilding Cuzco, the political and religious capital of the empire. Considerable effort was put into enlarging Sacsahuamán, the huge fortress built on a hill overlooking the city. At the same time he undertook a vast agricultural project over the entire upper end of the Cuzco Valley; rivers were channeled, the valley floor was leveled, and agricultural terraces were built on the surrounding hillsides. This reclamation project undoubtedly increased the agricultural productivity of the area and involved moving many of the original inhabitants of this part of the valley to other localities for several years while the work was being completed.
Pachacuti Inca Yupanqui also turned his attention to social problems. He decreed that no ruler could inherit property from his predecessor; instead, the property of a dead ruler was to pass to his other descendants, who could then support themselves from his lands and the labour taxes owed him. Consequently, each new emperor had to acquire land and labour to support his corporation and government. Pachacuti Inca Yupanqui thus ensured that the corporations of his eight predecessors had estates in the area around Cuzco so their members could support themselves adequately, attend certain ceremonies, and perform ceremonial obligations. Pachacuti Inca Yupanqui and his successors to the Inca throne formed corporations that had lands and estates scattered throughout the empire as well as in the Cuzco Valley itself.
He probably also began the policy of forced resettlement, or mitma, about this time, in order to ensure both loyalty to the state and better utilization of land resources, at least from the perspective of the Inca. This practice involved moving some members of an ethnic group from their home territory to distant lands. When a new area was conquered, loyal settlers were brought in from a province that had been under Inca rule long enough so that its residents knew how the Inca system of government worked. They were replaced in their home territories by recalcitrant groups from the newly conquered province. The policy had three important consequences: first, it broke up the size and power of an ethnic group by dispersing its members throughout the empire; second, it weakened the ability of an ethnic group to be self-sufficient; and, finally, it made it more difficult for the inhabitants of an area to revolt successfully.
Pachacuti Inca Yupanqui invented a state religion based on the worship of a creator-god called Viracocha, who had been worshiped since pre-Inca times. Priests were appointed, ceremonies were planned, prayers were prepared, and temples were built throughout the empire. He also expounded the view that the Inca had a divine mission to bring this true religion to other peoples, so that the Inca armies conquered in the name of the creator god. His doctrine was a relatively tolerant one. Conquered groups did not have to give up their own religious beliefs; they merely had to worship the Inca god and provide him and his servants with food, land, and labour. Topa Inca Yupanqui
About 1471, Pachacuti Inca Yupanqui abdicated in favour of his son Topa Inca Yupanqui, thereby ensuring the peaceful succession to the throne. Topa Inca Yupanqui was a great conqueror who was to bring most of the Central Andes region under Inca rule. Yet his first military campaign as emperor, an invasion of the tropical rain forest near the Tono River, was not particularly successful. The Inca were always fascinated with the rain forest and its products but never got used to military operations in this type of environment. This campaign did, however, establish trade relations with the area and secured a contingent of archers in return for a few bronze tools. The Emperor soon abandoned the campaign because of a revolt that had broken out in the Titicaca Basin. The rebellion was led by the Colla and Lupaca and was fanned by the rumour that Topa Inca Yupanqui had been killed during his expedition into the jungle.
The Colla’s mountaintop forts around Pucará fell one by one as the Inca attacked them. After subduing the Colla, the Inca moved against the Lupaca, who had retreated to the southwest corner of the Titicaca Basin, where they had allied themselves with another Aymara-speaking group, the Pacasa. The Inca armies were again victorious, and the revolt was ended. Topa Inca Yupanqui then turned southward, conquering all of highland Bolivia, northern Chile, and most of northwestern Argentina. He set the boundary markers of the Inca empire at the Maule River in central Chile.
At this point, the southern coast of Peru still had not been incorporated into the Inca state. The area, however, was now surrounded by the Inca on three sides, and in about 1476 Topa Inca Yupanqui launched a campaign against this region. Each valley, beginning with those in the south, was attacked separately. Most valleys submitted peacefully or put up only minimal resistance; the inhabitants of the Cañete Valley, however, put up a stubborn fight; and it took the Inca nearly three years to subdue them.
During the remainder of his reign, Topa Inca Yupanqui concerned himself with the administration of the empire. He spent much of his time traveling throughout his territories, making assignments of land and establishing local administrations. He introduced a system of classifying the adult male population into units of 100, 500, 1,000, 5,000, and 10,000, which formed a basis for labour assignments and military conscription. He also instituted a system of tribute in which each province provided Chosen Women (Aqllakuna) to serve as temple maidens in state shrines or to become the brides of soldiers who had distinguished themselves in combat. Huayna Capac
Topa Inca Yupanqui’s unexpected death in about 1493 precipitated a struggle for the succession. It appears that Topa Inca Yupanqui had originally favoured the succession of Huayna Capac (Wayna Qhapaq), the youngest son of his principal wife and sister. Shortly before his death, he changed his mind and named as his successor Capac Huari (Qhapaq Wari), the son of another wife. Capac Huari, however, never became emperor. The claims of his mother and her relatives were suppressed by the supporters of Huayna Capac. This group was led by Huaman Achachi (Waman ’Achachi), the child’s uncle and presumably the brother of the Emperor’s principal wife. A regent named Hualpaya (Walpaya) was appointed from this group to tutor Huayna Capac in the ways of government until the child was old enough to rule in his own name. Hualpaya, however, tried to assert the claims of his own son to the throne and, as a result, was killed by Huaman Achachi. Huayna Capac’s reign was mostly peaceful; he devoted much of his time to traveling, administering the empire, and suppressing small-scale revolts. He did extend the empire by conquering Chachapoyas, a mountainous country in northeastern Peru, and later northern Ecuador. After conquering Chachapoyas, he recruited part of his bodyguard from the warlike inhabitants of the area. The conquest of northern Ecuador occupied the last years of his life and took place shortly before the Spaniards arrived. During these campaigns, he pushed the frontiers of the Inca empire to the Ancasmayo River, the present-day boundary between Ecuador and Colombia.