Here is a brief timeline of the history, of Sardinia:
1,800-238 BC Nuraghic civilization
1,000-500 BC Phoenician colonies
500-238 BC Carthaginian colonies
238 BC-456 AD Roman occupation
456-534 AD Vandal raids
534-710 AD Byzantine rule
710-1354 Sardinian self-rule
1354-1720 Catalan (Spanish) rule
1720 Sardinia passes to Piedmont's Savoy Kingdom
1814 The Kingdom of Sardinia united with the Kingdom of Liguria
1861 Victor Emmanuel II , the first King of Italy.
Map Copyleft at Wikipedia.