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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1274 | 11 december | County - dinasty Aldobrandeschi | count Ildebrandino XI |
| 1294 | 18 may | countess Margherita | |
| 1313 | dinasty Orsini | count Romano | |
| 1327 | count Guido | ||
| 1348 | count Aldobrandino | ||
| 1384 | 6 may | count Bertoldo | |
| 1417 | count Nicoḷ I | ||
| 1425 | 1 february | count Aldobrandino II | |
| 1472 | count Nicoḷ II | ||
| 1510 | january | count Ludovico | |
| 1534 | 27 january | count Giovan Francesco | |
| 1567 | 8 may | count Nicola | |
| 1594 | 15 september | count Alessandro | |
| 1604 | 9 february | count Giannantonio | |
| 1604 | 9 june | Union to Greatduchy of Toscana |