They are usually found in caves I believe. If that is incorrect I could try to do some research but I'm pretty sure that's the answer :)
How did the styles and techniques of the Italian Renaissance spread to the North?
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There was a war in northern Italy and they left to go north. They would also go learn art then go back to their home. The northern Renaissance began in Flanders or modern day France.
Answer:
Christianity, Muslim, Islam
Most likely cause they took care of the sick.
Not sure though, need more context.
Hope this helps.