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| YEAR | DATE | EVENT | HEAD OF STATE |
| 876 | Marquisate | ||
| 888 | marquois Guido King of Italia | ||
| 892 | marquois Anscario I | ||
| 896 | marquois Adalberto | ||
| 925 | marquois Anscario II | ||
| 938 | marquois Lotario | ||
| 950 | marquois Guido II | ||
| 962 | marquois Corrado | ||
| 989 | marquois Arduino I King di'Italia | ||
| 1015 | marquois Ottone | ||
| 1026 | marquois Arduino II | ||
| 1029 | marquois Arduino III | ||
| 1089 | marquois Amedeo | ||
| 1097 | Free Common | ||
| 1266 | Monferrato Occupation | ||
| 1290 | Free Common | ||
| 1344 | Monferrato Occupation | ||
| 1349 | Union to Count of Piemonte |