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| YEAR | DATE | EVENT | HEAD OF STATE | |
| 888 | Count - dinasty Ucboldingi | earl Ubaldo | ||
| 893 | earl Bonifacio | |||
| 953 | earl Adalberto | |||
| 1011 | earl Valfredo | |||
| 1030 | earl Ugo | |||
| 1056 | earl Guido | |||
| 1099 | earl Alberto | |||
| 1102 | earl Milone | |||
| 1106 | earl Uberto | |||
| 1116 | Free Common | |||
| 1160 | Republic governed by annual mayor | |||
| 1194 | Republic governed by seven consuls | |||
| 1220 | Republic governed by annual mayor | |||
| 1296 | Republic governed by half yearly mayor | |||
| 1321 | Republic governed by senior consuls | |||
| 1327 | Republic governed by Gonfaloniere of Justice | |||
| 1335 | Republic governed by mayor | |||
| 1337 | 28 august | Lordship - dinasty Pepoli | sire Taddeo | |
| 1340 | sire and papal vicaire Taddeo | |||
| 1347 | 28 september | sire Giacomo and Giovanni | ||
| 1350 | 28 october | dinasty Visconti | sire Giovanni sire of Milan | |
| 1355 | sire Matteo sire of Milan | |||
| 1360 | 1 april | dinasty Oleggio | sire Giovanni | |
| 1376 | 20 march | Lordship - dinasty Azzoguidi | sire Taddeo | |
| 1377 | Republic governed by Gonfaloniere of Justice | |||
| 1399 | Lordship - dinasty Zambeccari | sire Carlo | ||
| 1401 | 28 february | dinasty Bentivoglio | sire Giovanni I | |
| 1402 | 30 june | dinasty Visconti | sire Gian Galeazzo duke of Milan | |
| 1402 | 3 september | sire Giovanni Maria duke of Milan | ||
| 1403 | 3 september | Church Territory | ||
| 1411 | 12 may | Popular Republic | ||
| 1412 | 14 august | Church Territory | ||
| 1416 | 3 january | Lordship - dinasty Bentivoglio | sire Anton Galeazzo | |
| 1420 | 27 january | Church Territory | ||
| 1428 | 2 august | Free Common | ||
| 1429 | 25 september | Church Territory | ||
| 1435 | Lordship - dinasty Canetoli | sire Battista | ||
| 1438 | 21 may | Lordship - Bentivoglio | sire Annibale I | |
| 1445 | 24 june | dinasty Marescotti | sire Galeazzo | |
| 1446 | 13 november | dinasty Bentivoglio | sire Santi Cascese | |
| 1462 | 1 october | sire Giovanni II | ||
| 1506 | 2 november | Church Territory | ||
| 1511 | 23 may | Lordship - dinasty Bentivoglio | sire Annibale II | |
| 1526 | june | Union to Church State |