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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1137 | Free Common | ||
| 1313 | Lordship - dinasty Monaldeschi | sire Ermanno | |
| 1337 | sire Ugolino | ||
| 1338 | sire Benedetto (I) | ||
| 1346 | sire Corrado I | ||
| 1347 | dinasty Orisini | sire Guido conte di Soana | |
| 1348 | dinasty Michelotti | sire Ceccolino | |
| 1350 | dinasty Monaldeschi | sire Benedetto (II) | |
| 1352 | dinasty Visconti | sire Giovanni arcibishop of Milano | |
| 1352 | dinasty Vico | sire John sire of Viterbo | |
| 1354 | Church Territory | ||
| 1387 | Lordship - dinasty Monaldeschi | sire Corrado II and Luca | |
| 1391 | dinasty Michelotti | sire Biordo | |
| 1398 | dinasty Tomacelli | sire Giovanni | |
| 1404 | Church Territory | ||
| 1412 | Lordship - dinasty Anjou | sire Ladislao King of Naples | |
| 1414 | sire Giovanna II Queen of Naples | ||
| 1417 | sire Braccio da Montone | ||
| 1420 | Church Territory | ||
| 1436 | Lordship - dinasty Monaldeschi | sire Gentile | |
| 1449 | sire Corrado III | ||
| 1450 | Union to Church Territory |