A new study of botanical remains found with three mummified Inca children atop the Llullaillaco volcano has revealed that their sacrifice likely occurred around 1499, during a period of rapid Inca imperial expansion. The analysis of corn, cassava, and coca plants buried with the victims offers a more precise chronological framework for the famous capacocha ritual, linking the children's deaths to the reign of Emperor Huayna Capac and his political motivations to consolidate control over newly conquered territories.
In 1999, archaeologists discovered the remarkably well-preserved remains of three children - a teenage girl known as the "Llullaillaco Maiden," a seven-year-old boy, and a six-year-old girl - near the 6,739-meter (22,109-foot) summit of the Llullaillaco volcano on the border of Argentina and Chile.
Johan Reinhard filming on summit of Llullaillaco volcano during the rescue of the Inca mummies in 1999. (Johan Reinhard/ CC BY-SA 3.0)
The victims of an Inca ritual called capacocha, the children were fattened up, given alcohol and coca, and left to die in a subterranean shrine. While their frozen bodies provided incredible insights into their final months, the exact date of their sacrifice remained elusive, with previous radiocarbon dating of their hair suggesting a broad window between 1430 and 1520.
To narrow down this timeframe, an international team of researchers led by Dominika Sieczkowska-Jacyna from the Silesian University of Technology in Poland turned to the short-lived plant offerings buried alongside the Llullaillaco Maiden. By analyzing the radiocarbon signatures and stable isotopes of maize, cassava, and coca leaves, the researchers established a new chronological framework. Their findings, published in the journal Archaeometry, pinpoint the sacrifice to between 1462 and 1507, with a statistical center around 1499.
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Llullaillaco mummy of 7 year old boy in Salta province, Argentina. (Joseph Castro/CC BY 2.0)
Political Motivations Behind the Capacocha Ritual
This refined date places the Llullaillaco capacocha squarely within the reign of Huayna Capac, one of the last great Inca emperors who ruled from 1493 to 1525. During his reign, the Inca Empire reached its greatest territorial extent, expanding north into present-day Ecuador and Colombia, while consolidating power in the southern regions previously conquered by his father, Tupac Inca. The area surrounding the Llullaillaco volcano had only recently been incorporated into the empire when the sacrifice took place.
"Our results suggest that political motivations were likely behind this particular capacocha, and the dating evidence helped us narrow the chronological framework of the offering," Sieczkowska-Jacyna explained. The researchers hypothesize that the ritual was enacted as part of a state-sanctioned campaign to ritually anchor the Inca presence in the region and establish alliances with local groups.
By sponsoring such elaborate ceremonies in distant provinces, the Inca rulers reinforced their authority and maintained cultural cohesion across a vast and diverse territory. Historical chronicles from the colonial era mention that Huayna Capac journeyed to the southern part of his empire, including the northwest region of modern Argentina, making rich offerings to the gods in the form of child sacrifices. While a direct link to the Llullaillaco burial cannot be confirmed with absolute certainty, the new dating evidence strongly aligns the sacrifice with these historical accounts.
Unlocking the Secrets of the Past
The study highlights the importance of using short-lived organic remains for radiocarbon dating in complex archaeological contexts. Because plants like maize and coca fix atmospheric carbon over a brief period, their radiocarbon signatures closely reflect the environmental conditions just before they were deposited. This allows for high-resolution dating that is essential for linking ritual activities to specific sociopolitical events.
As researchers continue to analyze other high-altitude Inca burial sites, such as the mummies found on Mount Ampato and Cerro El Plomo, similar methodological approaches could provide a clearer picture of how capacocha ceremonies fit into the broader political and cultural life of the empire. The tragic fate of the Children of Llullaillaco serves as a poignant reminder of the lengths to which the Inca state went to maintain its power and appease its gods.
Top image: "The Maiden", one of the discovered Llullaillaco mummies, a preserved Inca human sacrifice from around the year 1500. Source: grooverpedro/CC BY 2.0
By Gary Manners
References
Killgrove, K. 2026. 'Political motivations' of Inca emperor led to the sacrifice of 3 children on a snow-capped volcano over 500 years ago, study suggests. Live Science. Available at: https://www.livescience.com/archaeology/americas/famous-child-mummies-in-andes-may-belong-to-kids-who-were-sacrificed-to-ritually-anchor-the-incas-presence-as-their-empire-expanded
Milligan, M. 2026. Child sacrifice atop Llullaillaco volcano dated to Inca imperial expansion, study finds. Archaeology Mag. Available at: https://archaeologymag.com/2026/06/llullaillaco-maiden-dated-to-inca-imperial-expansion/
Sieczkowska-Jacyna, D. et al. 2026. Timing the sacred: A multi-step chronological framework for the Llullaillaco Inca burial. Archaeometry. Available at: https://onlinelibrary.wiley.com/doi/full/10.1111/arcm.70172
