"Relation des choses de Yucatan de Diego de Landa" by Diego de Landa is an ethnological account written around 1566. This work documents Maya culture, beliefs, religion, and calendars in the Yucatan province. Written by a Franciscan monk who had controversially destroyed Maya codices during an inquisition, the text paradoxically became a foundational scientific study of Maya civilization. The surviving manuscript, possibly an abridged version of the original, provides crucial insights into Maya writing systems and ceremonies.