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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1162 | Free Common | ||
| 1333 | Lordship - dinasty Ordelaffi | sire Francesco II sire of Forli | |
| 1361 | Church Territory | ||
| 1376 | Lordship - dinasty Ordelaffi | sire Sinibaldo I sire of Forli | |
| 1385 | sire Francesco III sire of Forli | ||
| 1405 | sire Antonio I sire of Forli | ||
| 1448 | sire Francesco IV sire of Forli | ||
| 1466 | sire Pino II sire of Forli | ||
| 1480 | dinasty Riario | sire Girolamo sire of Imola | |
| 1488 | sire Ottaviano sire of Imola | ||
| 1500 | dinasty Borgia | sire Cesare | |
| 1503 | Venice Occupation | ||
| 1509 | Union to Church State |