Fascinating evidence has emerged about historical migration patterns along Peru’s Pacific coast. According to recent data reports, these patterns formed centuries before the rise of the power and wealth of the Inca Empire. The study compares ancient DNA data to archaeological and historical data to show that pre-Inca coastal communities were more mobile and connected than previously believed.
New Study Reveals Population Movement Among Pre-Inca Communities
The study has provided some of the strongest evidence measuring population movement along the Pacific Coast before the establishment of Inca Rule in that part of present-day South America. This data demonstrates that pre-Inca coastal communities were far more mobile and connected at local and interregional levels than historical evidence has previously indicated.
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Map of the study area. A. Locations of the Chincha Valley and other Andean sites referenced in this study that yielded ancient DNA data. B. The archaeological sites under investigation for this study. (Jacob L. Bongers/Nature)
Originally published in Nature Communications, researchers suggested that these migratory peoples traveled more than 700 kilometers, walking from Peru’s north coast to the Chinchaga Valley in the south. Once the migration period ended, these nomads were able to settle and interact with the neighboring populations who surrounded them in their new environment. The migratory population maintained distinctive cultural traditions, such as cranial modifications, that set them apart from their community.
Mummified male body, South America, 800-1400 AD, (Wikimedia Commons/CC-BY)
Unique Cultural Traditions
There is no evidence that the migratory people of Peru had any contact with other nomadic people. However, their cultural traditions are remarkably similar to those of the Huns, a name referring to a violent migratory group. The name was created by the Chinese Han Dynasty ‘Xiongnu’ and vilified by the Visigoths, Ostrogoths, and Romans during the late 4th century AD. The Huns practiced cranial modification, and primary sources such as Ammianus Marcellinus documented their cultural practices.
Four hundred years later and thousands of miles away, the Peruvian migrants' use of cranial modification startled their new neighbors. Another unique practice was the burial tradition of painting the dead with a distinctive red pigment. These practices formed cultural barriers with their neighbors, and the migrants remained an amiable but insulated group that intermarried extensively. DNA analysis showed that the graves contained subjects who married close relatives. This practice, endogamy, maintains genetic purity among tribal units, families, or social classes. As an example, the study cited one large family grave that contained only people who engaged in close kinship marriages.
Peruvian mummy of Aymares from the Royal National Museum of Naples, 1871 AD. (Vittorio Steeger, Natural human mummy of Peruvian origin, lithograph, d. 1882/Public Domain)
Analyzing DNA Samples
The research team used DNA samples from 21 individuals recovered from numerous burial sites in the Chincha Valley to reconstruct family relationships and see how genetic diversity can be explored over time. Genetic evidence from these burials revealed a series of mixed ancestry between people from the north, central, and south coasts over numerous generations throughout centuries, who were coastal migrants that eventually settled in one location. Dr. Jacob Bongers asserts that this genetic diversity occurred when the original northern community migrated to Chincha. This community intermarried with migrant groups from neighboring coastal areas, a practice that continued until the Spanish Colonial Period (1532-1825 AD). Further genetic and bioarcheological data from these DNA samples also revealed close kinship matches.
Burial Practices Bind Family Relationships
“The fact that burial sites housed several family members together highlights the importance of familial units for ancient Andeans,” notes Assistant Professor Jordan Dalton of the State University of New York. These close biological relationships actually suggested that the DNA of sampled individuals from these burials was also members of an ayllu or parcialidad. These terms refer to a traditional, kin-based group that shares common territory, resources, and ancestry. These close kin unions may have also served as a strategy for retaining control over resources within a particular group.
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All these sampled individuals had some North Coast ancestry, demonstrating population consistency over a period of 200 years. This also coincides with the persistent cultural traditions that have been maintained in Chincha from the 13th to the 15th centuries AD. Dr. Bongers, using the data collected from research into the communities’burial practices, has been able to trace cultural practices, such as cranial modification, in hundreds of individuals. The modifications were carried out from infancy to shape the head using boards and bindings. After death, the distinctive red pigment was added to the skull.
“Mummy Bundle ‘Mask’” depicting a Paracas funerary textile from Peru’s South Coast. (Cleveland Museum of Art, The Norweb Collection/Public Domain)
The use of red pigment postmortem and cranial modifications is a unique cultural tradition that, while being long documented on Peru’s north coast, marked group identities.
Dr. Bongers also asserts that migration patterns across northern Peru aligned with major political and social changes along Peru’s coast, yet the motivation for these specific population movements remains uncertain. Current data expands the understanding of how and when interregional interaction occurred along the Andean Pacific coast. Over the generations, the Inca were able to incorporate highly mobile and deeply connected coastal communities into their empire.
The DNA analysis in Peru has created a pathway for extending the techniques to other locations worldwide. The research increases understanding of migration patterns for unique communities. It also traces cultural traditions like burial practices and endogamy. In Peru, the DNA data has explored the trends in genetic diversity that were shaped over centuries. The research shows both exclusion of outsiders from family groups and inclusion of migrant people into two different empires–the Inca and the Spanish.
Top image: Aerial view of a cemetery in the middle Chincha Valley. Photo by Jacob L. Bongers. Source: Jacob L. Bongers/Nature
By Ramsey Hardin
References
Ancient DNA reveals web of marriage and migration in Peru, May 22, 2026. https://www.eurekalert.org/news-releases/1128751
“Ancient DNA Reveals Web of Marriage and Migration in Peru – Eurasia Review.” Ancient DNA reveals web of marriage and migration in Peru, May 23, 2026. https://www.eurasiareview.com/23052026-ancient-dna-reveals-web-of-marriage-and-migration-in-peru/
Bongers, J.L., Dalton, J.A., Marsh, E.J. et al. Ancient DNA reveals a family ossuary and long-distance migration on the Pacific coast before the Inca Empire. Nat Commun 17, 4222 (2026). https://doi.org/10.1038/s41467-026-72216-y
Harley, Sadie, ed. Ancient DNA reveals web of marriage and migration in Peru centuries before Inca rule, May 22, 2026. https://phys.org/news/2026-05-ancient-dna-reveals-web-marriage.html
