What was the impact of northern European peoples upon western European medieval culture?

This would involve Islam, their influence on Northern Europe involved the creation of Mathematics, which spread to Spain and Italy, sooner or later, Geometry and Algebra were created. Just one of the few North-Western impacts on Western civilization :) show full answer. Looking for something else?

Is there a passage that comes with this question or should i know this right off the bat, because if it is, i probably have short term memory loss or college is too stressful