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| YEAR | DATE | EVENT | HEAD OF STATE |
| 859 | Count-bishopland | earl bishop Egilulfo | |
| 894 | x | ||
| 918 | earl bishop Ambrogio | ||
| 926 | x | ||
| 945 | earl bishop Pietro | ||
| 961 | earl bishop Guglielmo | ||
| 967 | earl bishop Martino | ||
| 981 | earl bishop Gumbaldo | ||
| 985 | earl bishop John | ||
| 1006 | Count - dinasty Canossa | earl Tedaldo | |
| 1012 | earl Bonifacio marquois of Toscana | ||
| 1052 | 7 may | earles Matilde marchesa of Toscana (I) | |
| 1115 | 24 july | Free Common | |
| 1272 | Lordship - dinasty Bonaccolsi | sire Pinamonte | |
| 1291 | january | sire Pinamonte and Bardellone | |
| 1293 | sire Bardellone | ||
| 1299 | 29 july | sire Guido | |
| 1309 | 24 january | sire Rinaldo | |
| 1328 | 26 august | dinasty Gonzaga | sire Luigi I |
| 1360 | 18 january | sire Guido | |
| 1369 | 22 septembere | sire Luigi II | |
| 1382 | october | sire Francesco I | |
| 1407 | 8 march | sire Gian Francesco | |
| 1433 | Marquisate | marquois Gian Francesco I | |
| 1444 | 23 september | marquois Luigi III | |
| 1478 | 11 june | marquois Federico I | |
| 1484 | 15 july | marquois Gian Francesco II | |
| 1519 | 29 march | marquois Federico II | |
| 1530 | 8 april | Duchy | duke Federico II |
| 1540 | 28 june | duke Francesco III | |
| 1550 | 22 february | duke Guglielmo | |
| 1587 | 14 august | duke Vincenzo I | |
| 1612 | 18 february | duke Francesco IV | |
| 1612 | 22 december | duke Ferdinando | |
| 1626 | 29 october | duke Vincenzo II | |
| 1627 | 26 december | duke Carlo I | |
| 1637 | 20 september | duke Carlo II | |
| 1665 | 14 august | duke Ferdinando Carlo | |
| 1708 | 5 july | Union to Duchy of Milan |