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| YEAR | DATE | EVENT | HEAD OF STATE |
| 948 | Count - dinasty Aleramici | earl Aleramo | |
| 954 | Marquisate | merchese Aleramo | |
| 991 | marquois Ottone I | ||
| 991 | marquois Guglielmo I | ||
| 1031 | marquois Enrico | ||
| 1040 | marquois Ottone II | ||
| 1084 | marquois Guglielmo II | ||
| 1111 | marquois Ranieri | ||
| 1140 | marquois Guglielmo IV | ||
| 1183 | marquois Corrado | ||
| 1192 | 28 april | marquois Bonifacio I | |
| 1207 | marquois Guglielmo V | ||
| 1225 | september | marquois Bonifacio II | |
| 1253 | marquois Guglielmo VI | ||
| 1292 | 6 february | marquois Giovanni I | |
| 1305 | 9 january | marquois Violante | |
| 1306 | 16 september | dinasty Paleologi | marquois Teodoro I |
| 1338 | 21 april | marquois Giovanni II | |
| 1372 | 20 march | marquois Secondo Ottone | |
| 1378 | 16 december | marquois Giovanni III | |
| 1381 | 25 august | marquois Teodoro II | |
| 1418 | 2 december | marquois Giangiacomo | |
| 1445 | 13 march | marquois Giovanni IV | |
| 1464 | 29 january | marquois Guglielmo VII | |
| 1483 | 28 february | marquois Bonifacio III | |
| 1493 | marquois Guglielmo VIII | ||
| 1518 | 4 october | marquois Bonifacio IV | |
| 1530 | 17 october | marquois Giangiorgio | |
| 1533 | 30 april | Occupation of H.R.E. | |
| 1536 | 5 january | dinasty Paleologi | marquois Margherita |
| 1566 | dinasty Gonzaga | marquois Guglielmo duke of Mantova | |
| 1574 | Duchy | duke Guglielmo duke of Mantova | |
| 1587 | 14 august | duke Vincenzo I duke of Mantova | |
| 1612 | 18 february | duke Francesco IV duke of Mantova | |
| 1612 | 22 december | duke Ferdinando duke of Mantova | |
| 1626 | 29 october | duke Vincenzo II duke of Mantova | |
| 1627 | 26 december | duke Carlo I duke of Mantova | |
| 1637 | 20 september | duke Carlo II duke of Manotva | |
| 1665 | 14 august | duke Ferdinando Carlo duke of Matova | |
| 1703 | Union to Principality of Piemonte |