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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1406 | 9 october | Lordship - dinasty Torelli | sire Guido I |
| 1415 | 23 january | Earldom | count Guido I |
| 1449 | 8 july | count Cristoforo I and Pietro Guido I | |
| 1456 | count Cristoforo I | ||
| 1460 | 6 march | count Marcantonio | |
| 1462 | august | count Marsilio I | |
| 1490 | 5 august | count Cristoforo II | |
| 1501 | count Francesco I | ||
| 1518 | 6 september | count Paolo I | |
| 1545 | 2 january | count Pomponio I | |
| 1608 | 12 april | count Pio I | |
| 1612 | 19 may | Union to Duchy of Parma and Piacenza |