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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1194 | Free Common | ||
| 1259 | Union to Count of Piemonte | ||
| 1275 | Free Common | ||
| 1278 | Lordship - dinasty Aleramici | sire Guglielmo VI marquois of Monferrato | |
| 1290 | Free Common | ||
| 1302 | Union to Count of Piemonte | ||
| 1356 | Lordship - dinasty Paleologi | sire Giovanni II marquois of Monferrato | |
| 1364 | Union to Count of Piemonte | ||
| 1369 | Union to Marquisate of Monferrato |