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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1647 | 19 july | Count | Philipp I |
| 1681 | 10 april | Friedrich Christian | |
| 1728 | 13 june | Albrecht Wolfgang | |
| 1748 | 24 september | Wilhelm | |
| 1777 | 10 september | Philipp II | |
| 1787 | 13 february | Georg Wilhelm | |
| 1807 | 18 april | Principality | Georg I |
| 1860 | 21 november | Adolf I Georg | |
| 1893 | 8 may | Georg II | |
| 1911 | 29 april | Adolf II | |
| 1918 | 16 november | Union to German State of Lower Saxony |