While Franciscan friars, inspired by Erasmus' ideal of a common tongue, applied principles of Latin grammar to Amerindian languages, native scholars translated the Gospels, a range of devotional literature, and even Aesop's fables into the Mexican language of Nahuatl. They also produced significant new writings in Latin and Nahuatl, adorning accounts of their ancestral past with parallels from Greek and Roman history and importing themes from classical and Christian sources to interpret pre-Hispanic customs and beliefs. Aztec Latin reveals the full extent to which the first Mexican authors mastered and made use of European learning and provides a timely reassessment of what those indigenous authors really achieved.