That's pretty much impossible to know.
More like intermediate.
from Tony Frudakis, Ph.D. - Molecular Photofitting: Predicting Ancestry and Phenotype Using DNA p. 424 (Google books)
"NOR1 admixture greater than or equal to 35% (row 2) and NOR1+NOR2 combined admixture greater than 45% (row 4) is strongly assiocated with iris color scores greater than 2.2 (Light) , which corresponds to color scores above the mean for individuals of majority European ancestry , and includes the light hazels , greens , and blues. In contrast , MIDEA and SA admixture leveles were individually associated with color scores below 2.2 (Dark) , corresponding to color scores below the mean (dark hazels , browns , blacks)"
Spain
http://w11.zetaboards.com/ethnodiver...pic/7720154/1/
Study 2 : Hoyos-Sánz
Fair-eyes color (includes blue, greenish and grey) :
Vasco-Navarra 39.2%
Aragón 34.9%
Castilla La Nueva 21.4%
Castilla La Vieja 21.1%
Baleares 21.0%
León 18.8%
Múrcia 16.9%
Extremadura 18.8%
Cataluña 14.5%
Asturias 19.1%
Valencia 12.1%
Galícia 12.3%
Granada 11.7%
Andalucía 10.7%
It could be both; a product of medieval Germanic conquest and just simply local variation.
http://whatishistory.edublogs.org/fi...empire-526.gif
I find some of this data about North Italy/Spain to be exaggerated. I've read studies that showed that the pigmentation difference between Southern and Northern Italy/Spain to be sizable but rather small.