The generation after Pachacuti
Pachacuti is remembered as the ruler who launched Inca expansion, but the empire reached most of its eventual size under his successors. According to the traditional chronology, his son Topa Inca took on military command in the 1460s and ruled from about 1471, and Topa Inca’s son Huayna Capac followed around 1493. These dates come from Spanish-era chroniclers and are approximate. The two rulers’ campaigns took the empire down the coast, deep into the south and far into the north.
The kingdom of Chimor
The greatest rival on the Peruvian coast was the kingdom of Chimor, usually called the Chimu. Its capital, Chan Chan, lay near the modern city of Trujillo in the Moche valley. Built largely of adobe, it contained several large walled compounds and is often described as one of the biggest cities in the pre-Columbian Andes. The Chimu kingdom flourished from around the 10th or 11th century, and it drew on the legacy of earlier coastal peoples such as the Moche, whose pyramids and tombs still stand in the same region.
Chimor controlled a long stretch of the north coast. Its power rested on irrigated agriculture, with canals bringing river water across the desert, and on skilled craftspeople who produced fine metalwork and textiles. This wealth and skill made it both a tempting target and a formidable opponent.
The Inca campaign
The conquest of Chimor is usually dated to around the 1470s, in the time of Topa Inca. Chroniclers describe a long campaign in which Inca forces moved down from the highlands into the coastal valleys, and they tell several versions of how Chimor was defeated. Some accounts mention cutting off or threatening the water supply, which would have been especially damaging in a desert kingdom, though the historical value of such stories is uncertain. It is likely that the Inca combined military pressure with diplomacy and that parts of the Chimu elite negotiated.
The aftermath is better documented. The Chimu ruler, Minchancaman, is said to have been taken to Cuzco, and many Chimu artisans, particularly metalworkers, were resettled to work for the Inca. This was part of a general policy of moving skilled people and valuable knowledge into the imperial heartland. Chimu styles in gold and silver influenced Inca imperial art, and the Chimu weavers continued a tradition of fine ancient weaving that Inca officials prized.
The Inca did not erase the coast’s existing way of life. They built administrative centres, linked the region to the Qhapaq Nan road system and extracted tribute, but they also kept some local officials in place. In this way, the conquest of the richest coastal kingdom added wealth and labour to the state with relatively little long-term upheaval.
Campaigns south and east
Topa Inca also campaigned in other directions. According to the chronicles, his armies pushed south into what is now Bolivia, northern Argentina and Chile, reaching toward the Maule River in central Chile, where Mapuche resistance appears to have halted further advance. In the east, attempts to push into the Amazon basin were less successful: the forests were hard to hold, and the Inca generally left them as a border zone with some trade and raiding. In the northeast Andes, the Chachapoya, a people of the cloud forests, were incorporated after fighting, in campaigns that continued into Huayna Capac’s time.
The northern frontier in Ecuador
Huayna Capac spent much of his reign in the north, in what is now Ecuador. The region contained several peoples, including the Cañari and the groups around Quito and Caranqui, and the Inca met strong resistance. Chroniclers describe years of fighting, with fortresses (pukara) built on hilltops and a severe battle near Lake Yahuarcocha, a name often translated as “lake of blood”. The Cañari first resisted and later became important Inca supporters, and then, after the conquest, allies of the Spanish.
Huayna Capac developed Quito and Tomebamba as northern centres, and his long stay there had lasting effects. The northern army, led by experienced commanders, became closely linked to his son Atahualpa. The Inca advance north of Ecuador was stopped or slowed by groups such as the Pasto, and the empire’s northern limit settled in the area around the modern border of Ecuador and Colombia.
Strengths and costs of conquest
These campaigns made the Inca empire the largest state in the pre-Columbian Americas. They also stretched its resources. Garrisons, forts and roads had to be maintained, and the demands of labour under the mita labor system bore heavily on communities near the frontiers. The rulers relied on loyal commanders, who could later become rivals, and on a population of subjects with varied loyalties. What had worked well in expansion was less well suited to managing a succession dispute.
The size and diversity of the territory made the empire hard to run, and historians often suggest that the territory grew faster than the institutions of Inca imperial society could easily adapt. The northern focus of Huayna Capac’s final years helped set the stage for the civil war between his sons, which weakened the state in the years before the Spanish landed. When he died around 1527, the empire stood at its widest extent, yet it was already vulnerable. In the story of the Tawantinsuyu empire, the conquests of Topa Inca and Huayna Capac mark both the peak of Inca power and the beginning of its most dangerous crisis.