|
|
| YEAR | DATE | EVENT | HEAD OF STATE |
| 920 | County - dinasty Aldobrandeschi | earl Ildebrando III | |
| 959 | earl Gherardo I | ||
| 966 | earl Rodolfo I | ||
| 973 | earl Rodolfo II | ||
| 988 | earl Ildebrando IV | ||
| 1015 | earl Enrico | ||
| 1040 | earl Ildebrando V | ||
| 1076 | earl Ranieri Malabranca | ||
| 1106 | earl Malagaglia | ||
| 1121 | earl Ugo II | ||
| 1152 | earl Ildebrando VII | ||
| 1195 | earl Ildebrando VIII | ||
| 1208 | earl Ildebrando IX | ||
| 1237 | earl Guglielmo | ||
| 1254 | earl Ildebrandino XI | ||
| 1294 | 18 may | earles MArgherita | |
| 1301 | Union to Orvieto | ||
| 1455 | Union to Siena |