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| YEAR | DATE | EVENT | HEAD OF STATE |
| 971 | Count-bishopland | earl bishop Andrea | |
| 1002 | earl bishop Nocherio | ||
| 1027 | earl bishop Olserico de' Gossalenghi | ||
| 1027 | earl bishop Ambrogio Arluno | ||
| 1051 | earl bishop Opizzone | ||
| 1075 | earl bishop Fredenzone | ||
| 1xxx | earl bishop Rinaldo | ||
| 1103 | earl bishop Arderico I Vignati | ||
| 1128 | earl bishop Allone | ||
| 1130 | earl bishop Guido | ||
| 1135 | earl bishop John | ||
| 1143 | earl bishop Lanfranco Cassini | ||
| 1158 | earl bishop Alberico I Merlino | ||
| 1168 | earl bishop Alberto Quadrelli | ||
| 1174 | earl bishop Alberico II Del Corno | ||
| 1189 | earl bishop Arderico II Del Corno | ||
| 1217 | Free Common | ||
| 1251 | Lordship - dinasty Vistarini | sire Sozzo (I) | |
| 1259 | dinasty Della Torre | sire Martino | |
| 1263 | sire Napoleone (I) | ||
| 1269 | Lordship - dinasty Vistarini | sire Sozzo (II) | |
| 1270 | dinasty Della Torre | sire Napoleone (I) | |
| 1275 | Lordship - dinasty Sommariva | sire Giacomo | |
| 1285 | dinasty Fissiraga | sire Antonio I (I) | |
| 1294 | dinasty Visconti | sire sire Matteo I sire of Milan | |
| 1302 | 12 july | Republic | |
| 1307 | Lordship - dinasty Fissiraga | sire Antonio I (II) | |
| 1311 | dinasty Fiandra | sire Enrico | |
| 1322 | dinasty Vistarini | sire Bassiano | |
| 1327 | sire Giacomo | ||
| 1328 | dinasty Temacoldo | sire Pietro | |
| 1335 | dinasty Visconti | sire Bruzi0 | |
| 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 Mialn | |
| 1378 | 4 august | sire Bernaḅ sire of Milan | |
| 1379 | sire Lodovico | ||
| 1403 | Lordship - dinasty Fissiraga | sire Antonio II | |
| 1403 | 23 november | dinasty Vignati | sire Giovanni |
| 1416 | 27 august | Union to Duchy of Milan |