| YEAR | DATE | EVENT | HEAD OF STATE |
| 1535 | Count | count Heinrich XVI/I | |
| 1572 | count Heinrich II | ||
| 1635 | count Heinrich III | ||
| 1640 | count Heinrich I | ||
| 1692 | count Heinrich XI | ||
| 1726 | count Heinrich I | ||
| 1744 | count Heinrich XII | ||
| 1784 | count Heinrich XLII | ||
| 1806 | 9 april | Principality | prince Heinrich XLII |
| 1818 | 17 april | prince Heinrich LXIII | |
| 1854 | 19 june | prince Heinrich LXVII | |
| 1867 | 11 july | prince Heinrich XIV | |
| 1913 | 29 march | prince Heinrich XXVII | |
| 1918 | 11 november | Union to German State of Thuringia |