The Muslims sacked Rome about 850 AD, and ruled Sicily from about 900 to 1100 AD.
Contemporary Islamists including OBL pepper their rants with references to retaking Andlusia (Spain). Some lunatic Saudi imam quoted over at memri.org was on a tear about the black flag flying over Rome "again".
They have the delusion that if some Muslim invaded a country, city, or town 1,000 years ago, then it's still "Muslim land."
To wit, the Jerusalem Temple Mount, aka al-Aqsa mosque.
That's a standard teaching. The Spanish and Italians better wise up quick.
I saw an old movie, "Confessions of a Nazi Spy". there was a line in it that went thusly: "Anywhere a German places his foot is the Fatherland". The Jihadists operate from the same playbook, "Mein Quran."