| YEAR | DATE | EVENT | HEAD OF STATE |
| 1034 | Count - dinasty Bretagne | earl Oddone I | |
| 1062 | earl Goffredo I | ||
| 1093 | earl Stefano I | ||
| 1125 | earl Goffredo II | ||
| 1148 | earl Rivallone | ||
| 1162 | earl Stefano II | ||
| 1177 | earl Alano I | ||
| 1212 | earl Enrico II | ||
| 1230 | dinasty Dreux | earl Pietro I | |
| 1235 | earles Iolanda | ||
| 1272 | Count of duke of Bretagne | ||
| 1317 | earl Guido | ||
| 1331 | earles Giovanna dukes Bretagne | ||
| 1341 | dinasty Chatillon | earl Carlo | |
| 1364 | earl John IV | ||
| 1403 | earl Oliviero | ||
| 1433 | earl John V | ||
| 1454 | earl Nicola | ||
| 1479 | Count of Principe of Orange | ||
| 1530 | Union to Kingdom of France |