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| YEAR | DATE | EVENT | HEAD OF STATE |
| 807 | Count | earl Suppone I | |
| 835 | earl Adalgiso I | ||
| 8x | earl Suppone II | ||
| 882 | earl Adalgiso II | ||
| 911 | earl Adalberto | ||
| 9x | earl Radaldo | ||
| 931 | earl Manfredo | ||
| 967 | earl Bernardo | ||
| 9x | earl Guido | ||
| 998 | earl Bernardo | ||
| 1037 | earl Bonifacio marquois of Toscana | ||
| 1051 | earl Arduino | ||
| 1073 | earl Uberto I | ||
| 1095 | earl Uberto II | ||
| 1095 | earl Alberto de' Giberti | ||
| 1101 | earl Ghiberto de' Ghiberti | ||
| 1111 | earles Matilde marchesa of Toscana | ||
| 1115 | 14 july | Free Common | |
| 1303 | 24 july | Lordship - dinasty Da Correggio | sire Giberto (I) |
| 1308 | 28 march | dinasty Rossi | x |
| 1308 | september | dinasty Da Correggio | sire Giberto (II) |
| 1311 | 27 january | dinasty Cocconato | sire Guido |
| 1311 | 14 april | dinasty Malaspina | sire Franceschino |
| 1311 | 27 september | dinasty Enrici | sire Falcone |
| 1311 | 6 december | dinasty Da Correggio | sire Giberto (III) |
| 1316 | 25 july | dinasty Sanvitale | sire Gianquirico |
| 1322 | 19 september | dinasty Rossi | sire Marsilio (I) |
| 1326 | 1 october | dinasty Della Torre | sire Passerino |
| 1328 | 25 september | dinasty Rossi | sire Rolando |
| 1329 | 18 november | sire Marsilio (II) | |
| 1331 | 5 march | dinasty Beccaria | sire Castellino |
| 1333 | october | dinasty da Sommo | sire Matteo |
| 1335 | 21 june | dinasty Della Scala | sire Alberto |
| 1341 | 22 may | dinasty Da Correggio | sire Azzo |
| 1344 | 24 october | dinasty Este | sire Obizzo III |
| 1346 | 22 september | sire Luchino sire of Milan | |
| 1349 | 24 january | sire Giovanni sire of Milan | |
| 1354 | 6 october | sire Matteo II sire of Milan | |
| 1355 | 26 september | sire Galeazzo II sire of Milan | |
| 1378 | 4 august | sire Bernaḅ sire of Milan | |
| 1385 | 6 may | sire Gian Galeazzo duke of Milan | |
| 1402 | 3 september | sire Giovanni Maria duke of Milan | |
| 1404 | 8 march | Lordship - dinasty Terzi | sire Ottobuono |
| 1409 | 28 may | sire Nicoḷ | |
| 1409 | 27 june | dinasty Este | sire Nicoḷ III |
| 1420 | 23 september | dinasty Visconti | sire Filippo Maria duke of Milan |
| 1447 | 15 august | Republic | |
| 1449 | 16 february | dinasty Sforza | sire Francesco I duke of Milan |
| 1466 | 8 march | sire Galeazzo Maria duke of Milan | |
| 1476 | 26 december | sire Gian Galeazzo Maria duke of Milan | |
| 1494 | 22 october | sire Ludovico Maria duke of Milan | |
| 1508 | sire Massimiliano duke of Milan | ||
| 1512 | 15 june | Church Territory | |
| 1515 | 26 october | French Occupation | |
| 1521 | 8 september | Church Territory | |
| 1545 | 24 august | Part od Duchy of Parma and Piacenza |