Deep in the Andes, atop the frozen summit of Llullaillaco volcano on the border of Argentina and Chile, archaeologists once found the remarkably preserved remains of three Inca children sacrificed centuries ago. Now a new scientific analysis has pinned down almost exactly when this ritual took place, and why it may have happened. By dating the plant offerings buried alongside the children rather than relying on the mummies themselves, researchers have narrowed a decades old mystery down to a single likely year, linking the sacrifice to the political ambitions of one of the last great Inca emperors as his empire pushed into new and unfamiliar territory.
The discovery of the Children of Llullaillaco
In 1999, archaeologists uncovered the mummified remains of three children, a teenage girl and two younger children around seven years old, just below the summit of Llullaillaco. Studies over the years have shown the children were fed rich foods and given alcohol and coca before being led to a shrine near the peak and left to die in a ritual known as capacocha. Despite the extraordinary preservation of the mummies, pinning down exactly when they died had remained difficult, with earlier radiocarbon testing of hair samples only placing their deaths somewhere between 1430 and 1520.
Dating plant remains instead of the mummies
To narrow this window, an international team of researchers turned to something less obvious than the bodies themselves, the food offerings buried with them. Their findings were published in the journal Archaeometry. Study lead author Dominika Sieczkowska-Jacyna, an archaeologist at the Silesian University of Technology in Poland, explained that the team wanted to place the sacrifice more precisely within the timeline of the Inca Empire’s growth in order to understand the political role such ceremonies played. The teenage girl, known as the Llullaillaco Maiden, was buried with corn, cassava and coca leaves, and it was the seeds from these offerings that gave researchers a far more accurate timestamp than the human remains had.
Narrowing the sacrifice to a single likely year
Radiocarbon dating of the botanical remains narrowed the possible date of the children’s deaths to between 1462 and 1507, with the most probable year landing around 1499. This period falls squarely within the reign of Huayna Capac, one of the final rulers of the Inca Empire, who governed from 1493 until his death from smallpox around 1525. Under his leadership and that of his father Tupac Inca before him, the empire expanded dramatically, stretching south into Chile and north into present day Ecuador and Colombia. By 1499, the region around Llullaillaco would have only recently come under Inca control, making the timing of the sacrifice especially significant.
A ritual tied to imperial expansion
The researchers believe the sacrifice was closely tied to Huayna Capac’s political strategy rather than being a routine religious event. According to the study, the ritual may have served to ritually anchor Inca presence in a newly absorbed region or to mark an important political milestone during his rule. Colonial era historical accounts also describe Huayna Capac travelling into the southern reaches of his empire, including areas of present day Argentina, and making offerings to the gods through child sacrifice during these journeys. Sieczkowska-Jacyna noted that while the team cannot attribute the event to a specific emperor with complete certainty, the most likely explanation connects it to an imperial expedition into the region, possibly aimed at forming alliances with local groups near the Titicaca Basin.
Capacocha as a tool of political control
Human sacrifice through capacocha was not simply symbolic, researchers say, but functioned as a deliberate tool for maintaining unity across a vast and culturally diverse empire. As the Inca absorbed new territories and peoples, rituals like this one may have helped reinforce loyalty and cosmic balance during a period the empire likely perceived as unstable, particularly as European contact loomed on the horizon. The study’s authors suggest that similar dating techniques should be applied to other known child sacrifices across the Andes, which could reveal broader patterns connecting ritual practice to the Inca Empire’s political expansion over time.The findings offer one of the clearest timelines yet for a sacrifice that has fascinated archaeologists for over two decades, showing how even small botanical clues buried alongside a body can reshape understanding of a much larger historical and political moment.
