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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1289 | Duchy dinasty Brunswick-Este | duke Wilhelm | |
| 1292 | Duchy of Duchy of Brunswick | ||
| 1373 | dinasty Brunswick-Este | duke Enrico II duke of Brunswick-Luneburg | |
| 1416 | duke Wilhelm II duke of Brunswick (I) | ||
| 1432 | duke Enrico II | ||
| 1473 | duke Wilhelm II duke of Brunswick (II) | ||
| 1482 | duke Wilhelm III | ||
| 1495 | duke Enrico III | ||
| 1514 | duke Enrico IV | ||
| 1568 | duke Giulio | ||
| 1589 | duke Enrico Giulio | ||
| 1613 | duke Federico Ulrich | ||
| 1634 | duke August | ||
| 1666 | 27 september | duke Rudolf August | |
| 1704 | 26 january | duke Antonio Ulrich | |
| 1714 | 27 march | duke August Wilhelm | |
| 1731 | 23 march | duke Ludwig Rudolf | |
| 1735 | 1 march | duke Ferdinand Albrecht | |
| 1735 | 3 september | Duchy of Brunswick | duke Karl I |
| 1780 | 26 march | duke Karl II | |
| 1806 | 10 november | duke Wilhelm I | |
| 1815 | 16 june | duke Karl III | |
| 1831 | 20 april | duke Wilhelm II | |
| 1884 | 18 october | duke Ernst August I | |
| 1913 | 1 november | duke Ernst August II | |
| 1918 | 8 november | Union to German State of Lower Saxony |