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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1430 | 19 november | Count | |
| 1662 | 28 april | Principality | Georg Christian |
| 1665 | 6 june | Christian Eberhard | |
| 1708 | 30 june | Georg Albrecht | |
| 1744 | 25 may | Count of Kingdom of Prussia | |
| 1810 | French Occupation | ||
| 1815 | Union to Kingdom of Hannover |