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| YEAR | DATE | EVENT | HEAD OF STATE |
| 816 | Count | earl Anteram | |
| 833 | earl Marius | ||
| 843 | earl Rothackar | ||
| 870 | earl Otto | ||
| 894 | earl Ambrose | ||
| 918 | earl Lintolf | ||
| 919 | earl Suppone | ||
| 921 | earl Giselbert I | ||
| 930 | earl Lanfranc I | ||
| 962 | earl Giselbert II | ||
| 1018 | earl Lanfranc II | ||
| 1026 | earl Arduin I | ||
| 1058 | earl Arduin II | ||
| 1064 | earl Rainier | ||
| 1066 | earl Ariald | ||
| 1079 | earl Giselbert III | ||
| 1093 | earl Albert | ||
| 1101 | earl Reginer | ||
| 1110 | Free Common | ||
| 1264 | Lordship - dinasty Della Torre | sire Filippo | |
| 1265 | sire Napoleone | ||
| 1277 | Free Common | ||
| 1301 | may | Lordship - dinasty Visconti | sire Matteo |
| 1302 | june | dinasty Scoto | sire Alberto |
| 1304 | may | dinasty Della Scala | sire Manfredo |
| 1321 | sire Federico | ||
| 1332 | 20 september | dinasty 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 duke of Milan | |
| 1402 | 3 september | duke Giovanni Maria duke of Milan | |
| 1407 | Lordship - dinasty Soardi | sire Giovanni Ruggero | |
| 1408 | dinasty Malatesta | sire Pandolfo | |
| 1419 | dinasty Visconti | sire Filippo Maria duke of Milan | |
| 1428 | july | Union to Republic of Venice |