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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1091 | Count dinasty Oldenburg | earl Egilmar I | |
| 1108 | earl Egilmar II | ||
| 1142 | earl Cristiano I | ||
| 1167 | earl Maurizio I | ||
| 1209 | earl Cristiano II | ||
| 1233 | earl John I | ||
| 1270 | earl Cristiano III | ||
| 1285 | earl John II | ||
| 1316 | earl Cristiano IV | ||
| 1324 | duke John III | ||
| 1344 | earl Corrado I | ||
| 1347 | earl John IV | ||
| 1356 | earl Ottone | ||
| 1357 | earl Corrado II | ||
| 1401 | earl Cristiano V | ||
| 1404 | earl Maurizio II | ||
| 1420 | earl Dietrich | ||
| 1444 | earl Cristiano I King of Danmark | ||
| 1454 | earl Gerardo VI | ||
| 1483 | earl John V | ||
| 1526 | earl Antonio | ||
| 1573 | earl John VII | ||
| 1603 | earl Antonio Gunther | ||
| 1667 | earl Cristiano V King of Danmark | ||
| 1699 | 4 september | Count of King of Danmark | |
| 1773 | 14 december | dinasty Oldenburg | earl Friedrich August Bishop of Lubeck |
| 1777 | 22 march | Duchy | duke Friedrich August Bishop of Lubeck |
| 1785 | 6 july | duke Wilhelm | |
| 1823 | 2 july | duke Peter I | |
| 1829 | 28 may | Greatduchy | greatduke August I |
| 1853 | 27 february | greatduke Peter II | |
| 1900 | 13 june | greatduke August II | |
| 1918 | 11 november | Union to German State of Lower Saxony |