I was just watching Vikings, and although it is not completely historically accurate, your mention of so many things being in Latin reminded me of a scene from it.
An English Prince was touring an older monastery and in conversation with the Abbot brought up the point that if they truly wanted to teach, and in turn spread the word of God, maybe they should consider conducting their sermons and even translating the Bible to English, so the common people could learn.
It struck me, because here was a man, who for all intents and purposes was one of the elite, yet, he knew that his country could not grow and prosper without the commoners.
He was taking a page from the Northmen in a sense. They did not have much of a written language, but what their so called royals knew, everyone knew, as it was all passed down in the same language, for everyone to learn.
History is always intriguing to me.