My family’s village in Abruzzo has been on the tax rolls for over 1,000 years. The ruins of the original village, just down the hill, has been dated to 500 A.D. The old dialect there, still spoken by many, is a collection of Italian, Latin, and words that apparently were generated locally and don’t exist anywhere else. A friend from the village wrote a book about it, very interesting.
I wonder if any of the local dialect words go back to the pre-Roman language of the area. European countries sometimes have a wealth of dialects, Italy especially. Villages a few miles apart may have different dialects.