The research pair looked at bones from the site dating back to 500–900 C.E. and discovered the remains of those who had died or were killed were treated very differently depending on whether they were from their own people or were those of enemies. Bones found inside the compound, they noted showed signs of being treated with respect, whereas those outside were not only abused, but showed evidence of cannibalism.
During the time when the people were living there, the researchers note, the area was under stress, enduring upheaval due to rapid change—Teotihuacan city had collapsed and a new society was under development, one that consisted of multiple smaller scale groups living across the Northern Frontier. That inevitably led to violence, which the researchers note, can be seen in how the bodies of the vanquished were treated. The bones show marks indicative of cutting and were also splintered and sometimes burned—all signs of both abuse and cannibalism. They also found skulls with holes bored in them, which seems to suggest they were hung for still living enemies to see, a means perhaps, of warding off further attacks. Other evidence of the violence that occurred was the architecture itself, fortresses meant to keep invaders at bay.
Meanwhile, bones found inside the compound showed signs of a different kind of cut marks—shallow indentations, which generally are attributable to defleshing and desiccation, both signs of veneration of the dead. That suggests those people were loved ones, in some cases, possibly even ancestors, rather than immediate relatives.
The researchers suspect that the much of the conflict between groups in the area at the time was ethnically based, but will need to do isotopic and DNA analysis to confirm their theory.
Yirka, Bob. 2015. “Bone analysis reveals violent history of pre-Hispanic Mesoamerica”. Phys.org. Posted: May 5, 2015. Available online: http://phys.org/news/2015-05-bone-analysis-reveals-violent-history.html