The Council of Tours in 813 mandated that sermons be delivered in rustic Roman or Germanic tongues rather than Latin, reflecting a significant shift in the Church's approach to communication. This decree aimed to make religious teachings more accessible to the laity, fostering greater understanding and participation in the faith. The decision highlighted the evolving relationship between language, culture, and religion during the early medieval period.

The Council of Tours Vernacular Preaching Decree in 813 officially recognized the divergence of vernacular languages from Latin. This legitimization paved the way for the development of Old French and other Romance languages as vehicles for serious expression, ultimately influencing the rise of vernacular literature and poetry.