During the middle ages who was most likely to own a manuscript or book?

A duke or duchess.

I doubt a duke or duchess could read, much feel the need to own books! People in the Catholic Church would, though. Remember -- in the Middle Ages, there were no printing presses yet!

https://about-history.com/how-were-books-made-in-the-middle-ages/

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I think it was duke or duchess too

duke or duchess is the answer

i would think the answer was, duke or duchess. since they were the ones that could offered to learn how to read

afford*