| YEAR | DATE | EVENT | HEAD OF STATE | |
| 1569 | Count - dinasty Asburgo | earl Massimiliano II H.R.E. | ||
| 1576 | earl Rodolfo II H.R.E. | |||
| 1597 | dinasty Nassau | earl Filippo Guglielmo | ||
| 1618 | earl Maurizio | |||
| 1625 | earl Federico Enrico | |||
| 1647 | earl Guglilemo | |||
| 1650 | earl Guglilelmo III King of Great Britain | |||
| 1702 | Count of King of Prussia | |||
| 1866 | Union to Kingdom of Prussia | |||
| 1918 | Union to German State of Lower Saxony |