I want to know the answer to the following question:
The mosaics in churches of Ravello prove what?
All the background I'm provided with is that "Southern Italy was also part of the Norman kingdom but great mosaics did not survive in this area except the fine mosaic pavement of the Otranto Cathedral from 1166, with mosaics tied into a tree of life, mostly still preserved.". Is that enough to answer the question?
Answer: no