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| YEAR | DATE | EVENT | HEAD OF STATE | |
| 984 | Lordship - dinasty Canossa | sire Tedaldo | ||
| 1012 | sire Bonifacio markgraf of Toscana | |||
| 1052 | 7 may | siress Matilde markgraf of Toscana | ||
| 1115 | 24 july | Free Common | ||
| 1196 | Lordship - dinasty Torelli | sire Salinguerra (I) | ||
| 1209 | dinasty Este | sire Azzo VI | ||
| 1212 | 18 november | sire Aldobrandino I | ||
| 1215 | 10 october | sire Azzo VII (I) | ||
| 1222 | dinasty Torelli | sire Salinguerra (II) | ||
| 1240 | dinasty Este | sire Azo VII (II) | ||
| 1264 | 16 february | sire Obizzo II | ||
| 1293 | 21 february | sire Azzo VIII | ||
| 1308 | 31 january | sire Aldobrandino II | ||
| 1308 | 27 november | sire Fresco | ||
| 1308 | 27 november | Venice Occupation | ||
| 1309 | 28 august | Church Territory | ||
| 1317 | 15 august | Lordship - dinasty Este | sire Rinaldo and Nicoḷ I | |
| 1335 | 31 december | sire Nicoḷ I and Obizzo III | ||
| 1344 | 1 may | sire Obizzo III | ||
| 1352 | 20 march | sire Aldobrandino III | ||
| 1361 | 2 november | sire Nicoḷ II | ||
| 1388 | 26 march | sire Alberto | ||
| 1393 | 30 july | sire Nicoḷ III | ||
| 1441 | 29 december | sire Leonello | ||
| 1450 | 1 october | sire Borso duke of Modena | ||
| 1471 | 14 april | Duchy | duke Borso duke of Modena | |
| 1471 | 19 august | duke Ercole I duke of Modena | ||
| 1505 | 25 january | duke Alfonso I duke of Modena | ||
| 1534 | 31 october | duke Ercole II | ||
| 1559 | 3 october | duke Alfonso II duke of Modena | ||
| 1597 | 27 october | duke Cesare duke of Modena | ||
| 1598 | 30 january | Union to Church State |