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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1171 | Free Common | ||
| 1305 | Lordship - dinasty Trinci | sire Nallo | |
| 1321 | sire Ugolino I | ||
| 1338 | sire Corrado I | ||
| 1343 | sire Ugolino II | ||
| 1353 | sire Trincia | ||
| 1377 | sire Corrado II | ||
| 1386 | sire Ugolino III | ||
| 1415 | sire Niccolò | ||
| 1421 | sire Corrado III | ||
| 1439 | dinasty Sforza | sire Francesco duke of Milan | |
| 1447 | Union to Church States |