Nonsense. Every fantasy novel/movie/whatever out there is based on a random mishmash of medieval European culture, with no regard for the fact that things were very different in different parts of Europe. It's all bunched together as medieval "European" armor, architecture, etc. in the exact same way that medieval "Asian" things get bunched together.
All of Europe tends to get bunched together as being somehow "European", with the possible exception of northern Europeans, who instead get steretyped as "vikings" (angry men with beards). Usually ignoring the fact that there's a 4-500 year time gap between classic vikings (before 1000 A.D.) and classic knights in shining armor (after 1400 A.D.).