The Inca Empire at Its Height

The Inca Empire at its height refers to the territorial, demographic, and cultural peak of the empire of Tawantinsuyu in the early sixteenth century, conventionally dated to the reign of the eleventh Sapa Inca, Huayna Capac (r. c. 1493–1527). At its greatest extent, Tawantinsuyu stretched roughly 4,000 kilometers along the Andes, from the Ancasmayo (now Angasmayo) river in southern Colombia to the Maule river in central Chile, and from the Pacific coastal desert eastward into the cloud forests and lowlands of the Amazon basin. Its population, which is estimated from tribute registers, archaeological survey, and early colonial censuses, is generally placed in the range of about ten million, with scholarly estimates spanning roughly six to fourteen million, and the empire was administered through a system of provinces, road networks, and state storehouses without parallel in the pre-industrial world. The article on the size of the Inca Empire at its greatest extent surveys the demographic and geographic evidence, while the article on the economic organization of Tawantinsuyu examines how such a large and diverse population was fed, taxed, and governed.

The apogee of the empire is also the moment at which the seeds of its destruction were laid. Huayna Capac spent many years on the northern frontier, away from Cusco, and the empire was weakened by the introduction of epidemic disease, possibly as early as the 1520s, and by factional disputes among the royal panacas. The death of Huayna Capac, probably of smallpox brought by travelers to the Caribbean coast, in or around 1527 was followed by the civil war between Huáscar and Atahualpa that exhausted the empire on the eve of the Spanish arrival. The political background of this period is set out in the account of the rise of the Inca Empire, and the broader context in the general history of the Inca civilization.

The Reign of Huayna Capac

Huayna Capac succeeded his father Túpac Inca Yupanqui around 1493, in circumstances that are not entirely clear. The chronicles describe a contested succession, in which a rival heir was defeated and the new emperor consolidated his hold on the throne. The principal military achievements of Huayna Capac’s reign were in the north, where he led several campaigns that extended Inca rule into the highland valleys of what is now Ecuador and southern Colombia. Among the peoples incorporated in these campaigns were the Pasto, the Caranqui, and the Cayambe, all of whom offered fierce resistance. The chronicler Garcilaso de la Vega, whose father was one of the Inca nobles who accompanied the emperor on campaign, describes in detail the long sieges and the construction of roads and garrisons in the tropical lowlands east of the Andes.

Huayna Capac’s long absences from Cusco allowed the politics of the central court to be shaped by regents, mothers, and the royal panacas of deceased emperors. The panacas were the descent groups that held the wealth, the mummies, and the political rights of past Sapa Incas, and they formed the true nobility of the empire. The principal panacas of the late imperial period were those of Pachacuti, Túpac Inca Yupanqui, and Huayna Capac himself, each centered on a great royal estate near Cusco. The political tensions between these panacas, and between the Cusco aristocracy and the growing northern power base built up by Huayna Capac during his long campaigns, would set the stage for the civil war that broke out after the emperor’s death.

The reign of Huayna Capac was also the period in which some of the most striking works of Inca architecture were completed. The great royal estate of Machu Picchu, traditionally attributed to Pachacuti’s reign (c. 1450) and probably completed or substantially expanded during the reign of Huayna Capac, was constructed on a saddle of the Cordillera Vilcabamba above the Urubamba valley. The fortress of Ollantaytambo, the temple of the Sun at Coricancha in Cusco, and many of the tambos and qollqas along the royal road system all date from this period or shortly before. The article on the architecture of Cusco examines the urban program of the late imperial capital.

Geographic Extent and Demography

The territory of Tawantinsuyu at its greatest extent has been reconstructed from a variety of sources: the relaciones geográficas of the early colonial period, the early Spanish administrative divisions, the distribution of Inca-style architecture, the place-names recorded in Quechua, and the tribute records preserved on quipus. The resulting picture is of an empire of roughly 1.5 to 2 million square kilometers, extending through every major ecological zone of the central Andes. The article on the size of the Inca Empire at its greatest extent maps the empire region by region and assesses the available evidence.

The population of the empire is the subject of continuing scholarly debate. The first systematic estimates, made in the 1960s by the historical demographers Henry F. Dobyns and John Murra, ranged from six to sixteen million. More recent estimates, drawing on regional archaeological surveys and updated colonial censuses, cluster around ten million. The most heavily populated regions were the central Andean highlands around Cusco and Quito, the north coast of Peru, and the Lake Titicaca basin, each of which supported complex agrarian societies based on a combination of tubers, maize, and animal protein from camelid herds. The full discussion of population and the limits of the demography of Tawantinsuyu is set out in the article on the size of the Inca Empire at its greatest extent.

The geography of the empire imposed a number of constraints on the imperial administration. The vertical range of Tawantinsuyu — from sea level on the Pacific coast to altitudes of more than 4,500 meters in the high Andes — required an extraordinary diversity of agricultural and pastoral techniques, and it shaped the way in which populations were organized. The article on the four regions of Tawantinsuyu describes how the empire was divided into four great quarters and dozens of provinces, while the article on Inca provinces and administration examines the local government of each region.

Economic Organization

The economy of the Inca Empire was fundamentally redistributive rather than market-based. Most subjects lived in self-sufficient ayllus that provided their members with access to land, water, and pastures; the state, in turn, claimed a share of the labor and produce of the empire in the form of the mit’a tax. Mit’a required adult subjects to perform a fixed amount of labor each year on state projects: the construction of roads, terraces, temples, and fortifications; the mining and refining of metals; the weaving of textiles; and the support of armies on campaign. The article on the economic organization of Tawantinsuyu examines the structure of this system in detail.

The state used the labor and produce thus mobilized to support a network of officials, priests, military garrisons, and craft specialists, and to maintain a system of state storehouses, the qollqas, that held surplus production in trust against years of poor harvest, war, or other emergencies. The qollqas are described in detail in the article on state storage and qollqas, and the road system that linked them is treated in the article on the Inca road system. The redistribution of stored goods to subjects in need was a central feature of the political legitimacy of the Sapa Inca, and the destruction of the qollqa system by the Spanish was a major cause of the demographic catastrophe that followed the conquest.

There was no money in the European sense, and the internal market economy was relatively undeveloped. The state did, however, maintain craft workshops called akllawasi that produced fine textiles, metalwork, and ceramics for the use of the court, the army, and the religious establishment. The article on Inca textiles and crafts examines the role of the state weavers and the symbolic and political importance of cloth in the imperial order, and the article on Inca food and agriculture describes the agricultural base on which the system depended.

Administration and the Four Suyus

The administrative structure of the empire is described in detail in the article on Inca provinces and administration. The empire was divided into four great regions, called suyus, corresponding to the four quarters of the cosmos and the four roads that led out of Cusco. The northern quarter, Chinchasuyu, included the central and northern highlands and the north coast; the eastern quarter, Antisuyu, extended into the cloud forest of the eastern slopes; the western quarter, Contisuyu, included the central and south-central highlands; and the southern quarter, Collasuyu, included the Lake Titicaca basin and the territories to the south. The four regions are examined in detail in the article on the four regions of Tawantinsuyu.

Each suyu was divided into provinces, and each province into smaller units of local administration. The heads of provinces were typically members of the Inca nobility or of loyal local dynasties that had been integrated into the imperial order, and they were supervised by officials sent from Cusco. Tribute, military service, and labor were reckoned by a sophisticated system of population counts and mit’a assessments, recorded on quipus and read by specially trained officials called quipucamayocs. The article on the quipu and record keeping describes the technology and social role of the knotted-string records on which the entire administrative system depended.

The political center of the empire was the city of Cusco, whose plan reflected the imperial order. The architecture of the imperial capital is treated in the article on the architecture of Cusco and the Coricancha, and the great estates of the Sacred Valley just north of the city are described in the article on the Sacred Valley. Beyond Cusco, the empire relied on a network of administrative centers, each typically built around a rectangular plaza, a Sun temple, a state storehouse, and the residence of the local governor. The article on top Inca military campaigns describes the role of these centers in the imperial project.

Cultural and Architectural Apex

The late imperial period was a time of extraordinary cultural and architectural achievement. The Inca state mobilized the labor of the empire to build thousands of kilometers of road, hundreds of tambos and qollqas, and dozens of great ceremonial centers. The most famous of these is Machu Picchu, whose polished dry-stone walls, terraced agriculture, and integration with the surrounding landscape exemplify the technical and aesthetic ideals of imperial Inca architecture. The article on Machu Picchu and other iconic sites treats the site in detail, while the article on Inca stonework describes the technology behind it.

The cultural life of the empire at its height was equally elaborate. The court of the Sapa Inca was a center of religious ceremony, music, dance, and ritual feasting, and the Inca pantheon was maintained by a hierarchy of priests attached to Sun temples throughout the empire. The article on Inca music and festivals describes the major public celebrations, including the great festival of the winter solstice, Inti Raymi, still celebrated in Cusco each June. The dead Sapa Incas were mummified and treated as continuing members of the royal panacas, and the cults of mummies and ancestor veneration formed a central part of imperial religion.

The social hierarchy of the imperial capital and the great royal estates is described in the article on Inca social hierarchy, while the kinship structures that underpinned the imperial order are treated in the article on the family and the ayllu. The empire at its height represented the full flowering of the institutional, religious, and architectural program begun under Pachacuti, and the account of it is incomplete without reference to the origins of the Inca on which the program was built.