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| YEAR | DATE | EVENT | HEAD OF STATE |
| 965 | Count - dinasty Meulent | earl Robert I | |
| 990 | earl Robert II | ||
| 997 | earl Hughes I | ||
| 1015 | earl Galeran I | ||
| 1079 | earles Adeline | ||
| 1081 | dinasty Beaumont | earl Robert III | |
| 1118 | earl Galeran II | ||
| 1166 | earl Robert IV | ||
| 1204 | Union to Kingdom of France |