Social Classes: The Nobel class was the highest class and consisted of government, military leader, high level priests, and lords. The commoner class consisted of farmers, artisans, merchants, and low-level priests. The serfs and slaves were the lowest class.
Collapse of Aztec society linked to catastrophic salmonella outbreak : Nature News & Comment
Collapse of Aztec Society Linked to Catastrophic Salmonella Outbreak DNA of 500-year-old bacteria is first direct evidence of an epidemic — one of humanity's deadliest — that occurred after Spanish conquest.
Collapse of Aztec society has been linked to a catastrophic salmonella outbreak: go.nature.com/2lS7KYr