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| YEAR | DATE | EVENT | HEAD OF STATE |
| 785 | Mark of H.R.E. | ||
| 840 | dinasty Saxe | markgraft Liudolfo | |
| 850 | Duchy | duke Liudolfo | |
| 866 | duke Bruno | ||
| 880 | 2 february | duke Ottone I | |
| 912 | 13 november | duke Enrico I Re of Germania | |
| 936 | 2 july | duke Ottone I H.R.E. (I) | |
| 945 | duke Enrico II | ||
| 955 | duke Ottone I H.R.E. (II) | ||
| 962 | dinasty Billunghi | duke Ermanno | |
| 973 | 1 april | duke Bernardo I | |
| 1011 | duke Bernardo II | ||
| 1059 | duke Ottone III | ||
| 1072 | duke Magnus | ||
| 1106 | 28 august | dinasty Supplimburgo | duke Lotario II H.R.E. |
| 1137 | 4 december | dinasty Guelfi-Este | duke Enrico X duke of Bavaria |
| 1139 | dinasty Ascani | duke Alberto I | |
| 1142 | dinasty Guelfi-Este | duke Enrico XII duke of Bavaria | |
| 1180 | 7 april | dinasty Ascani | duke Bernardo III |
| 1212 | duke Alberto II | ||
| 1261 | Duchy of Saxe-Wittemberg | duke Alberto III | |
| 1298 | 25 august | duke Rodolfo I | |
| 1356 | Principality Electoral | p.e. and duke Rodolfo II | |
| 1370 | 6 december | p.e. and duke Venceslao | |
| 1388 | p.e. and duke Rodolfo III | ||
| 1419 | p.e. and duke Alberto IV | ||
| 1422 | 27 november | Union to Duchy of Brunswick |