^^^ Exactly.
I would quibble about all Moors or Berbers being "Caucasian" because that term is more social than biologically descriptive but as pointed out the European people with the most genetic African inheritance are from Iberia, not Sicily.
Some of this heritage is thought to go back to prehistoric times (i.e more than 10,000 years prior) The rest might have come via Roman conquest, Vandal conquests, Atlantic Slave trade, migrations, Moorish conquest, and of course people just getting together to do the do as they've always done.
Some of the latest science suggests that "white" skin, as Americans would understand it anyway is a relatively recent development in Europe (6-7000 yrs ago)
Population groups always shade (pun definitely intended) into each other. It's difficult to draw hard and fast lines.
http://en.wikipedia.org/wiki/African_admixture_in_EuropeHaplogroup L lineages are relatively infrequent (1% or less) throughout Europe with the exception of Iberia where frequencies as high as 22% have been reported and some regions of Italy where frequencies as high as 2% and 3% have been found. According to a study in 2012 by Cerezo et al., about 65% of the European L lineages most likely arrived in rather recent historical times (Romanization period, Arab conquest of the Iberian Peninsula and Sicily, Atlantic slave trade) and about 35% of L mtDNAs form European-specific subclades, revealing that there was gene flow from sub-Saharan Africa toward Europe as early as 11,000 yr ago...
