| YEAR | DATE | EVENT | DUKE |
| 1627 | Duchy - Oldenburg dinasty | Ernesto Gunhter | |
| 1689 | Federico I | ||
| 1692 | Ernesto Augusto | ||
| 1731 | Cristiano Augusto | ||
| 1754 | Federico Cristiano I | ||
| 1794 | Federico Cristiano I | ||
| 1814 | Cristiano | ||
| 1869 | Federico II duke of Schleswig | ||
| 1880 | Union to Duchy of Schleswig |