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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1444 | Count - dinasty Gonzaga | earl Alessandro | |
| 1466 | 16 january | earl Rodolfo | |
| 1495 | 6 july | earl Luigi Alessandro | |
| 1549 | 19 july | earl Ferdinando I | |
| 1586 | 13 february | earl Rodolfo II | |
| 1593 | 3 january | earl Francesco | |
| 1616 | 23 october | prince Luigi I | |
| 1636 | 22 february | prince Ferdinando II | |
| 1659 | 22 february | Principality | prince Ferdinando II |
| 1675 | 23 april | prince Carlo I | |
| 1680 | 21 may | prince Ferdinando III | |
| 1723 | 13 feburary | Union to Duchy of Mantova |