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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1106 | Count | count Godfrey | |
| 1110 | dinasty Schauenburg | count Adolph I | |
| 1131 | count Adolph II | ||
| 1164 | count Adolph III | ||
| 1225 | count Adolph IV | ||
| 1238 | count John I | ||
| 1263 | count Adolph V and John II | ||
| 1273 | count John II | ||
| 1316 | count John III | ||
| 1359 | count Adolph VII | ||
| 1390 | count Nicholas | ||
| 1397 | count Gerhard VI and Albert | ||
| 1403 | count Gerhard VI | ||
| 1404 | count Henry III | ||
| 1427 | count Adolph VIII and Gerhard VII | ||
| 1433 | count Adolph VIII | ||
| 1460 | Union to Duchy of Schleswig | ||
| 1474 | Duchy united to Duchy of Schleswig | ||
| 1865 | Duchy under Austrain administration | ||
| 1866 | Duchy under Prussian administration | ||
| 1918 | Union with Schleswig into German State of Schleswig-Holstein |