Religion
During the Middle Ages the monks were the people who preserved books and wrote books. The population of the Middle Ages couldn't read or write and there were really no schools for them to go to. Monks spent years creating and copying books. One of the great books that was done in this time was the Book of Kells.
They were valuable
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hand
Illuminated manuscripts .
it was handwritten.
Yes, and not just during the middle ages. The Church maintained an Index Librorum Prohibitorum - a list of banned books - which the faithful were forbidden to read. The Index was abolished in 1966.
Medieval books are manuscripts, which means they were written by hand.
No one is really sure. Books based in the middle ages with weird narritive, is only a guess of the way people talked back then.
The period of time from 500 AD to 1500 AD is called the Middle Ages.
Books were often locked in chests during the Middle Ages to protect them from theft, damage, and unauthorized access. The scarcity and high value of books made them prized possessions that needed to be safeguarded. Additionally, some books contained valuable knowledge or religious texts that were considered sacred and needed to be protected.