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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1274 | 11 december | County - dinasty Aldobrandeschi | count Ildebrandino |
| 1283 | count Ildebrandino Novello | ||
| 1331 | count Stefano | ||
| 1346 | 13 december | count Senese | |
| 1386 | count Guido | ||
| 1438 | 3 july | Sėdinasty Sforza Santa Fiora | count Bosio I |
| 1476 | march | count Guido | |
| 1508 | count Federico | ||
| 1535 | count Bosio II | ||
| 1538 | august | count Sforza | |
| 1575 | 21 october | count Mario I | |
| 1611 | 13 november | count Alessandro | |
| 1631 | 29 april | count Mario II | |
| 1633 | 7 december | Union to Greatduchy of Toscana |