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Melanargia lachesis
Nice find dnl.grosso,it would be great if you add it to the http://www.projectnoah.org/missions/1331...
If you ever see one in Italy there are more species and subspecies there too :-)
Actually it's interesting that I did't remember it but I had already one Marbled White in my collection that I had found in Germany. So now I have two slightly different species from different parts of Europe...
See also eurobutterflies.com by Matt Rowlings:
http://www.eurobutterflies.com/sp/laches...
"This species replaces the marbled white M. galathea in the Iberian peninsular. Ranges overlap in north Spain and south France".
In M. galathea, the basal end of the forewing cell is shaded black. It is mostly entirely white here.