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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1027 | Count-bishopland | ||
| 1406 | Union to Rimini | ||
| 1519 | 1 november | Earldom - dinasty Pio | count Alberto III |
| 1531 | january | count Leonello II | |
| 1571 | 20 march | count Alberto | |
| 1580 | count Rodolfo | ||
| 1597 | june | Principality - dinasty Aldobrandini | prince Gianfrancesco |
| 1601 | 17 september | prince Giorgio | |
| 1637 | 6 may | princess Olimpia | |
| 1681 | 18 december | dinasty Pamphili | prince Giovanni Battista |
| 1709 | prince Camillo Filippo | ||
| 1747 | prince Girolamo | ||
| 1760 | Union to Church State |