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| YEAR | DATE | EVENT | HEAD OF STATE |
| 979 | Count-bishopland | ||
| 1167 | Free Common | ||
| 1261 | Lordship - dinasty Pallavicibi | sire Oberto sire of Pavia | |
| 1266 | Free Common | ||
| 1278 | Lordship - dinasty Aleramici | sire Guglielmo VI marquois of Monferrato | |
| 1290 | Free Common | ||
| 1314 | Lordship - dinasty Visconti | sire Marco | |
| 1322 | dinasty Anjou | sire Roberto King of Naeaples | |
| 1343 | 26 january | siress Giovanna I Queen of Naeaples | |
| 1348 | Union to Duchy of Milan | ||
| 1404 | Lordship - | sire Facino Cane | |
| 1412 | Union to Duchy of Milan | ||
| 1735 | Union to Principality of Piemonte |