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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1037 | Count | ||
| 1485 | count Heinrich XIII | ||
| 1535 | Senior Line | count Heinrich XIV/I | |
| 1572 | count Heinrich V | ||
| 1604 | count Heinrich IV | ||
| 1629 | count Heinrich I | ||
| 1681 | count Heinrich VI | ||
| 1697 | count Heinrich II | ||
| 1722 | count Heinrich XI | ||
| 1800 | count Heinrich XIII | ||
| 1806 | 9 april | Principality | prince Heinrich XIII |
| 1817 | prince Heinrich XIX | ||
| 1836 | prince Heinrich XX | ||
| 1859 | prince Heinrich XXII | ||
| 1902 | 29 march | prince Heinrich XXIV | |
| 1918 | 11 november | Union to German State of Thuringia |