The introduction and dissemination of that title in the academic world is due to anthropologist Miguel León Portilla who, in 1980, published a book titled Tōltēcayōtl, aspects of the Nahuatl culture.
León Portilla's interpretation of the concept of Toltecayotl is based on a set of principles that were collected in the Huēhuehtlahtōlli[REF] or 'book of the ancient words', which includes traditional parliaments preserved by oral tradition and other documents.