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| YEAR | DATE | EVENT | HEAD OF STATE |
| 998 | Count-bishopland | earl bishop Sigifredo Adalberto | |
| 1032 | earl bishop Pietro Milanese | ||
| 1038 | earl bishop Riccardo Capuano | ||
| 1041 | earl bishop Ivone | ||
| 1045 | december | earl bishop Guido | |
| 1048 | 9 august | earl bishop Dionigi | |
| 1077 | 21 september | earl bishop Maurizio | |
| 1089 | earl bishop Bonizzone | ||
| 1091 | earl bishop Winrico | ||
| 1096 | earl bishop Aldo Gabrielli | ||
| 1122 | earl bishop Arduino | ||
| 1126 | Free Common | ||
| 1253 | Lordship - dinasty Pallavicino | sire Oberto (I) | |
| 1257 | 26 july | dinasty Fontana | sire Alberto |
| 1260 | dinasty Pallavicino | sire Oberto (II) | |
| 1266 | Free Common | ||
| 1271 | Lordship - dinasty Anjou | sire Carlo king of Napoli | |
| 1281 | Free Common | ||
| 1290 | june | Lordship - dinasty Scoto | sire Alberto (I) |
| 1304 | 4 december | Free Common | |
| 1307 | 24 july | Lordship - dinasty Scoto | sire Alberto (II) |
| 1308 | january | dinasty Della Torre | sire Guido |
| 1309 | 6 may | dinasty Scoto | sire Alberto (III) |
| 1310 | Free Common | ||
| 1312 | 18 march | dinasty Scoto | sire Alberto (IV) |
| 1313 | dinasti Visconti | sire Galeazzo sire of Milano | |
| 1322 | 9 october | Church Territory | |
| 1335 | 25 july | Lordship - dinasty Scoto | sire Francesco |
| 1336 | 15 december | dinastu Visconti | sire Azzone sire of Milan |
| 1339 | 17 august | 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 sire of Milan | |
| 1402 | 3 september | sire Giovanni Maria duke of Milan | |
| 1404 | 1 october | dinasty Terzi | sire Ottobono |
| 1410 | 10 november | dinasty Vignati | sire Giovanni |
| 1414 | january | dinasty Visconti | sire Filippo Maria duke of Milan |
| 1415 | 21 october | dinasty Arcelli | sire Filippo |
| 1418 | 13 june | Union to Duchy of Milan | |
| 1512 | 24 june | Church Territory | |
| 1545 | 24 august | Union to Duchy of Parma |