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| YEAR | DATE | EVENT | HEAD OF STATE |
| 1918 | 23 october | Croatian occupation | Antonio Grossich |
| 1918 | 17 november | Independent State | Antonio Grossich (I) |
| 1920 | 8 september | Italian protectorate | Gabriele D'Annunzio |
| 1920 | 29 december | Riccardo Gigante (I) | |
| 1920 | 31 december | Antonio Grossich (II) | |
| 1921 | 27 april | Riccardo Gigante (II) | |
| 1921 | 28 april | Salvatore Bellasich | |
| 1921 | 13 june | Antonio Foschini | |
| 1921 | Luigi Amantea | ||
| 1921 | 5 october | Riccardo Zanella | |
| 1922 | 9 march | Giovanni Giurati | |
| 1922 | 17 march | Attilio Depoli | |
| 1923 | 17 september | Gaetano Giardino | |
| 1924 | 16 march | Union to Kingdom of Italy | |
| 1943 | 8 september | German occupation | |
| 1945 | april | Union to Yugoslavia |