De Vulgari Eloquentia

Italy, late Middle Ages: The fabric merchants need to write down their contracts in a language that everyone can understand, and the literates are looking for an alternative to the elite of the traditional Latin language, so the Volgare, the language spoken by the common people, taken from the dialects spoken in the various Italian regions, starts to gain relevance. During this period, Francesco D'Assisi writes his famous Canticle of the Sun and Dante writes the Divine Comedy, both written in Volgare.