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Nahuatl was the lingua franca of medieval Mesoamerica. It was the common language of, e.g., the Aztec Empire. Tula de Allende was the center of a large pre-Aztec civilization, and continue to be important when they took over, and when the Spanish arrived, around 1546 they established a monastery there. It's the christening records from that monastery that I'm looking at; it is so cool see such blatant evidence of mixed language names. I'm really hoping that (a) I can find records from the same monastery from early decades and (b) a nice history of the monastery, because I'd love to see what kind of info I can find about population percentages -- how many were native, how many were Spanish imports, how many of the Spanish imports were women, etc.