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| YEAR | DATE | EVENT | HEAD OF STATE | |
| 871 | Count-bishopland | earl bishop Leodolino | ||
| 893 | earl bishop Giovanni | |||
| 898 | earl bishop Gemenolfo | |||
| 902 | earl bishop Gotifredo | |||
| 933 | earl bishop Ardingo | |||
| 943 | earl bishop Guido | |||
| 968 | Count - dinasty Canossa | earl Attone | ||
| 981 | earl Tedaldo | |||
| 1012 | earl Bonifacio marquois of Toscana | |||
| 1052 | 7 may | earles Matilde marquois of Toscana | ||
| 1115 | 24 july | Free Common | ||
| 1288 | 15 december | Lordship - dinasty Este | sire Obizzo II | |
| 1293 | 13 february | sire Azzo VIII | ||
| 1306 | 26 january | Free Common | ||
| 1311 | 1 august | Lordship - dinasty Pico | sire Francesco (I) | |
| 1317 | 8 july | dinasty Bonaccolsi | sire Passerino sire of Mantova (I) | |
| 1318 | 18 january | dinasty Pico | sire Francesco (II) | |
| 1319 | 30 november | dinasty Bonaccolsi | sire Passerino sire of Mantova (II) | |
| 1327 | april | Church Territory | ||
| 1328 | 27 november | dinasty Panico | sire Ettore | |
| 1329 | 15 december | dinasty Pio | sire Guido | |
| 1333 | sire Manfredo | |||
| 1336 | 17 april | dinasty Este | sire Obizzo III sire of Ferrara | |
| 1352 | 20 march | sire Aldobrandino III sire of Ferrara | ||
| 1361 | 2 november | sire Nicoḷ II sire of Ferrara | ||
| 1388 | 26 march | sire Alberto sire of Ferrara | ||
| 1393 | 30 july | sire Nicoḷ III sire of Ferrara | ||
| 1441 | 29 december | sire Leonello sire of Ferrara | ||
| 1450 | 1 october | sire Borso duke of Modena | ||
| 1452 | 18 may | Part of Duchy of Modena and Reggio |