Wow
Just a few points...
1. Sicily was in no way connected to France, except that the de Hautevilles came from Normandy.
2. Sicily was not "conquered" by the HRE. Henry VI was a legitimate claimant to the throne via his marriage to Constance, Roger II's daughter and Heir. Henry soon died, and Frederick Roger was a Sicilian before all else. By birth and upbringing... our greatest King after Roger.
3. The Angevins lost Sicily in 1282....
4. Peter of Aragon was also a legitimate claimant to the throne, via his marriage to Constance, the daughter of King Manfred of Sicily. Aragon did not conquer Sicily. The Sicilian nobles offered the crown of Sicily to Peter, and he helped us drive out the Angevins.
5. Sicily was to be ruled by a cadet branch of the House of Aragon (the crowns of Sicily and Aragon we not to be help by the same person), and was independent until around 1411.
If you think Sicily was un-important in the Middle Ages, you really need to re-read your history books. Sicily made the renaissance possible...Dante learned his art at Frederick Sicilian court...