This is Melanargia galathea - the Marbled White. I don't see them here in Spain - we have a variant called the Iberian Marbled White - but they are very similar.
Yes, on Wikipedia they say that you have the Iberian Marbled White, similar to the M. galathea.
I saw this site:
Do you think it could be a male of spp. galathea?
There is a subtle colour difference between the male and female, the male being marked with an almost grey pattern while the female is a dark brown. However, to make a sex determination on that basis you would have to be absolutely sure of the colour balance in your photo. I use RAW format and I can adjust colour temperature back in the office on the PC so I can easily perform sex change operations :-) Your photo suggests a hint of brown and if the colour temperature is correct I would favour female.
I think it is the basic marbled white, Melanargia galathea.
I'm not completely happy with the markings on the forewing underside, towards the tip, but as this page shows, there is a lot of variation.
There are other Melanargia spp. but I think M. galathea is the best fit (and it does occur in Italy).
Your views Alan?
Update: ah - you beat me to it
Here is another view, but the photo is not good, it was almost to fly:
This second photo confirms my view of Marbled White and also the sex as female since the upper forewing pattern is different between males and females. It's an old specimen - most of the fringe and costa on the left wing has gone!
I know what you mean. However, I checked all the related species last night and it's the hind wing underside that is most distinctive. The marbled white and Iberian marbled white are the only ones with the dark discal band that reduces to a single line near the cell so the question is, could this be an out of range Iberian? But then the forewing becomes important, not at the tip, but again at the discal mark which is bigger and broader in galathea than lachesis, as in Marcello's photo.