The Mayans Ritually Sacrificed Young Boys, Many Related

The team behind the new study was able to extract and sequence ancient DNA from 64 out of around 100 individuals, whose remains were found scattered in a water chultún — an underground storage chamber discovered in 1967 about 400 meters (437 yards) from the sacred sinkhole in Chichén Itzá.

With radiocarbon dating, the team found that the underground cavern was used for 500 years, although most of the children whose remains the team studied were interred there between AD 800 and 1,000 — during the height of Chichén Itzá’s political power in the region.

All the children were boys, who had been drawn from the local Maya population at that time, according to the DNA analysis, and at least a quarter of them were closely related to at least one other child in the chultún. The group also included two pairs of twins as well as siblings and cousins. Most of the boys were between 3 and 6 years old when they died.

Analysis of variants or isotopes of carbon and nitrogen in the bones also suggested that the related children had similar diets. Together, according to the authors, these findings suggested that related male children were likely selected in pairs for ritual sacrifices linked to the chultún.

“It is surprising to me to see family members, given the enormous time breadth of the deposit, which by radiocarbon dates is now confirmed to have been used over a time span of 500 years, during which these bodies slowly accumulated,” said Vera Tiesler, a bioarchaeologist and professor at the Autonomous University of Yucatán, in an email. She wasn’t involved in the research.

While the study authors believe this finding reveals the only known burial of sacrificed male children, Tiesler said that the ancient Maya ritual calendar was complex, likely with different “victim profiles” for different religious occasions throughout the year and time cycles.

From CNN discussing the following paper:

The ancient city of Chichén Itzá in Yucatán, Mexico, was one of the largest and most influential Maya settlements during the Late and Terminal Classic periods (AD 600–1000) and it remains one of the most intensively studied archaeological sites in Mesoamerica. However, many questions about the social and cultural use of its ceremonial spaces, as well as its population’s genetic ties to other Mesoamerican groups, remain unanswered. 

Here we present genome-wide data obtained from 64 subadult individuals dating to around AD 500–900 that were found in a subterranean mass burial near the Sacred Cenote (sinkhole) in the ceremonial centre of Chichén Itzá. 

Genetic analyses showed that all analysed individuals were male and several individuals were closely related, including two pairs of monozygotic twins. Twins feature prominently in Mayan and broader Mesoamerican mythology, where they embody qualities of duality among deities and heroes, but until now they had not been identified in ancient Mayan mortuary contexts. 

Genetic comparison to present-day people in the region shows genetic continuity with the ancient inhabitants of Chichén Itzá, except at certain genetic loci related to human immunity, including the human leukocyte antigen complex, suggesting signals of adaptation due to infectious diseases introduced to the region during the colonial period.

Rodrigo Barquera, et al., "Ancient genomes reveal insights into ritual life at Chichén Itzá" Nature (June 12, 2024) (open access).

The discussion in the paper of the possible religious beliefs associated with the sacrifices or of the 16th century Spanish accounts of the practice (some of which, like the gender of the sacrifice victims, is provable wrong), is intriguing. See also the Dresden Codex which has origins at the same Mayan site:

The Dresden Codex is a Maya book, which was believed to be the oldest surviving book written in the Americas, dating to the 11th or 12th century. However, in September 2018 it was proven that the Maya Codex of Mexico, previously known as the Grolier Codex, is, in fact, older by about a century. The codex was rediscovered in the city of Dresden, Germany, hence the book's present name. It is located in the museum of the Saxon State Library. The codex contains information relating to astronomical and astrological tables, religious references, seasons of the earth, and illness and medicine. It also includes information about conjunctions of planets and moons. . . . 

The Dresden Codex is described by historian J. Eric S. Thompson as writings of the indigenous people of the Yucatán Peninsula in southeastern Mexico. Maya historians Peter J. Schmidt, Mercedes de la Garza, and Enrique Nalda confirm this. Thompson further narrows the probable origin of the Dresden Codex to the area of Chichen Itza, because certain picture symbols in the codex are only found on monuments in that location. He also argues that the astronomical tables would support this as the place of origin. Thompson claims that the people of the Yucatán Peninsula were known to have done such studies around 1200 A.D. Thompson also notes the similar ceramic designs in the Chichen Itza area which are known to have ceased in the early thirteenth century. British historian Clive Ruggles suggests, based on the analyses of several scholars, that the Dresden Codex is a copy and was originally written between the twelfth and fourteenth centuries. Thompson narrows the date closer to 1200 to 1250. Maya archaeologist Linton Satterthwaite puts the date when it was made as no later than 1345.

A natural response to these human sacrifices is to ask "why" and to put it in the context of some narrative, which can be done only incompletely.