Penny S... yes, I know about the history of the area... and that's why it works as an example... you have historic documents along with archaeological evidence to corroborate the genetic evidence. They work together to help fill out the picture of our past.   

If you only know about Sicily from movies like the Godfather, you would assume that they are all like stereotypical southern Italians. Only by delving deeper do you get a more accurate understanding. Though, of course, their next door neighbors in Sicily might not have quite the same makeup. It just reminded me of a story my mom told about a young patient at the dental office she worked at who had been given a hard time by his teacher when they did a report on their family backgrounds. She accused him of making it up when he wrote that he was part Chinese. The teacher later got a visit from his rather upset Eurasian mother. Hopefully she learned her lesson not to assume.