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| YEAR | DATE | EVENT | EARL |
| 1270 | Count - dinasty Oldenburg | Ottone II | |
| 1304 | John I | ||
| 1347 | Cristiano I | ||
| 1355 | Cristiano II | ||
| 1367 | Ottone IV | ||
| 1418 | Nicola arcibishop of Brema | ||
| 1434 | Maurizio | ||
| 1464 | Gerardo VI earl of Oldenburg | ||
| 1500 | John V earl of Oldenburg | ||
| 1526 | Giorgio | ||
| 1529 | John VI | ||
| 1548 | Antonio I earl of Oldenburg | ||
| 1573 | Antonio II | ||
| 1619 | Antonio Enrico | ||
| 1622 | Cristiano III | ||
| 1647 | Count of Count of Oldenburg | ||
| 1829 | Union to Greatduchy of Oldenburg |