Abstract
Several things were responsible for the spread of the vernacular language. The one thing that stood out as a consequence is religion. It seems only logical that the end result would have been what it was from all the factors that were responsible.

Vernacular refers to the speech used in a particular town or community. Up until the Fourteenth Century, Latin was the vernacular most widely used in the then civilized world. It was used by the religious leaders in the churches and by the aristocracy of the time. This was to show power and wealth and breeding. It was the noblewomen who commissioned works of music and literature and poetry into Latin to preserve it.
Latin was the prevalent language as it comes from the Romans who had conquered most of the land and territories of Europe. As the Roman Empire grew, so did the Latin language, both spoken and written, no matter the native dialect. This made it easy to use in business but for religious purposes this created a problem. Business men knew that they could travel from port to port and speak to each other in a Latin with no inherent problems. Both spoke the same language for trading. However when the religious sect tried to convert other cultures to Roman Catholicism, if the people they were trying to convert were not of the rich and influential, the communication was hard. Eventually the vernacular language of the particular culture or territory took over and Latin was not used in these areas any longer.
The Ronan Catholic Church wished to make Christianity available to everyone, not just the rich and powerful who could read and write Latin. Monks, who were well versed in science and the bible, as well as the vernacular languages, were commissioned to create alphabets in the common vernacular to translate the bible from Latin so that everyone could read it. This way it would be even easier to convert the native people in their own vernacular..