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| YEAR | DATE | EVENT | HEAD OF STATE |
| 850 | Count-bishopland | ||
| 1100 | Common under rule of Counts of Biandrate | ||
| 1137 | Free Common | ||
| 1168 | Common-bishopland | ||
| 1183 | Free Common | ||
| 1260 | Lordship - dinasty Pelavicino | sire and emperor vicar Oberto | |
| 1263 | dinasty Torriani | sire Napoleone | |
| 1277 | dinasty Visconti | sire arcibishop Ottone (I) | |
| 1278 | dinasty Aleramici | sire Guglilemo VI marquois of Monferrato (I) | |
| 1282 | dinasty Visconti | sire arcibishop Ottone (II) | |
| 1289 | dinasty Aleramici | sire Guglilemo VI marquois of Monferrato (II) | |
| 1298 | dinasty Visconti | sire Galeazzo | |
| 1301 | Free Common | ||
| 1302 | Lordship - dinasty Brusati | sire Guglielmotto | |
| 1310 | Common of H.R.E. - dinasty Malaspina | vicar of emperor Francesco | |
| 1311 | dinasty Savoy | vicar of emperor Filippo | |
| 1313 | Common under H.R.Emperor | ||
| 1332 | Lordship - dinasty Visconti | bishop Giovanni | |
| 1354 | sire Galeazzo (I) | ||
| 1356 | dinasty Paleologi | sire John II marquois of Monferrato | |
| 1358 | dinasty Visconti | sire Galeazzo (II) | |
| 1378 | Union to Milan | ||
| 1402 | Lordship | sire Facino Cane | |
| 1412 | Union to Duchy of Milan | ||
| 1735 | Union to Pincipate of Piemonte |