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| YEAR | DATE | EVENT | HEAD OF STATE |
| 882 | Bishopland | ||
| 999 | Count-Bishopland | ||
| 1141 | Free Common | ||
| 1263 | Lordship - dinasty Torriani | sire Paganino | |
| 1266 | sire Gottofredo | ||
| 1277 | dinasty Aleramici | sire Guglielmo VI marquois of Monferrato | |
| 1290 | dinasty Visconti | sire arcibishop Ottone sire of Milan | |
| 1295 | august | sire Matteo sire of Milan | |
| 1302 | 12 july | dinasty Avogadro | sire Simone |
| 1312 | dinasty Tizzone | sire Riccardo | |
| 1312 | dinasty Anjou | sire Roberto King of Neaples | |
| 1321 | dinasty Visconti | sire Giovanni sire of Milan (I) | |
| 1331 | dinasty Luxembourg | sire Giovanni king of Bohemia | |
| 1332 | dinasty Paleologi | sire Teodoro I marquois of Monferrato | |
| 1334 | dinasty Visconti | sire Giovanni sire of Milan (II) | |
| 1335 | dinasty Savoy | sire Giacomo count of Piemonte | |
| 1367 | sire Amedeo count of Piemonte | ||
| 1377 | dinasty Visconti | sire Bernaḅ sire of Milan | |
| 1385 | sire Giangaleazzo duke of Milan | ||
| 1402 | 3 september | sire Giovanni Maria duke of Milan | |
| 1404 | Lordship - dinasty Paleologi | sire Teodoro II marquois of Monferrato | |
| 1417 | dinasty Visconti | sire Filippo Maria duke of Milan | |
| 1428 | Union to Principality of Piemonte |