What helped the spread of the Renaissance into Northern Europe?

What helped the spread of the Renaissance into Northern Europe was the  growth of cities and the support of monarchs that had contributed to the spread of Renaissance ideas. The Northern Renaissance provided a verity of great artists, writers, and scholars. Printing and the use of the vernacular helped to spread Renaissance ideas and increase learning.

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to keep us neatruel and not get involved in any wars

he assumed control of treaty negotiations with a hostile power

i would say it is the roman empire europe after the norman conquest.