Since I only know of jesters in passing... I have no idea if there's any relevance or not. I'm going to have to start researching and seeing if we can pen down when we have definitve evidence of jesters in court. Most of what I can recall at the moment is firmly in the medieval ages... (1400's upto 1900's) but if there's evidence of the tradition dating back to late Viking Age (800-1300) this may prove an interesting back alley to get lost in.
I love it when my brain goes down odd paths.