The Blonde Hair Map

Apropos the last post, here is a map of the distribution of blonde hair across Europe, via Strange Maps.



Any guesses as to where the "blonde gene" first cropped up?

By the way, I don't want to sully the Vikings' good name by implying that they may have been engaged in any lascivious behavior during their various rampages across Europe, but it's interesting to compare the blonde map with this map of Viking invasions.