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c. 1524-1528Reputable source · 2 sourcesDebated

Smallpox Arrives Ahead of the Spanish and Kills Huayna Capac

A European disease outruns the Europeans themselves, killing the emperor and his chosen heir before a single conquistador reaches Peru

On the timeline · around c. 1524-1528 · Tawantinsuyu at Its HeightTawantinsuyu at Its HeightCivil War and the Spanish ConquestSmallpox Arrives Ahead of the Spanish and Kills Huayna Capac15051510151515201525

Quick facts

Ruler killed
Huayna Capac
Heir also killed
Ninan Cuyuchi
Disease (disputed)
Smallpox (some scholars argue measles)
Regional death toll cited
65-90% in some areas

What happened

An epidemic of Old World disease, generally identified in the sources as smallpox, spread down through the Americas ahead of the Spanish themselves, likely carried by indigenous trade and travel networks from the Caribbean and Central America, where the Spanish had already been present for years. World History Encyclopedia states the disease killed Huayna Capac in 1528 along with his intended heir, Ninan Cuyuchi, who had also been being groomed for the throne, and that in some regions the epidemic killed 65 to 90 percent of the population. Because Huayna Capac died without a settled second heir, since his first choice had also died of the same disease, the succession passed into open dispute between two surviving sons, Huascar and Atahualpa.

Why it matters

This epidemic is why the Inca empire was already collapsing internally before Pizarro's forces ever crossed into Peru: it killed the ruler, his chosen successor, and an unknown share of the administrative class and general population all at once, then triggered the succession crisis that became a civil war. Some modern epidemiological historians dispute whether smallpox specifically, as opposed to measles or another disease, was the actual killer, and even the exact year of Huayna Capac's death is not fully settled among historians.

How we know

The identification of the disease and its death toll comes down through Spanish-era accounts written after the fact, not direct medical observation at the time, which is why later researchers have revisited both the specific disease and the precise chronology; World History Encyclopedia's date of 1528 is one of several proposed in the literature.

Sources

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Part of a timelineThe Inca Empire26 events · How a highland kingdom without writing, wheels, or iron built the largest empire the Americas ever saw, then lost it in a single generationView all →