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| YEAR | DATE | EVENT | HEAD OF STATE |
| 970 | Marquisate - dinasty Este | marquois Alberto Azzo I | |
| 1029 | marquois Alberto II | ||
| 1097 | marquois Folco I | ||
| 1128 | 15 december | marquois Obizzo I | |
| 1193 | 25 december | marquois Azzo III | |
| 1212 | 18 november | marquois Aldobrandino I | |
| 1215 | 10 october | marquois Azzo IV | |
| 1264 | 16 february | marquois Obizzo II | |
| 1293 | 13 february | marquois Azzo V | |
| 1308 | 1 february | marquois Aldobrandino II | |
| 1326 | 27 july | marquois Rinaldo II | |
| 1335 | 31 december | marquois Obizzo III | |
| 1352 | 20 march | marquois Aldobrandino III | |
| 1361 | 2 december | marquois Nicoḷ II | |
| 1388 | 26 march | marquois Alberto | |
| 1393 | 30 july | marquois Nicoḷ III | |
| 1395 | 3 april | Union to Republic of Venice | |
| 1438 | Union to Duchy of Ferrara | ||
| 1484 | 7 august | Union to Republic of Venice |