| YEAR | DATE | EVENT | GOVERNOR |
| 1870 | march | Italian occupation | |
| 1882 | december | Italian protectorate | Giulio Pestalozzi |
| 1885 | 5 february | Tancredi Saletta (I) | |
| 1885 | 15 december | Carlo Gené | |
| 1887 | 18 march | Tancredi Saletta (II) | |
| 1887 | november | Alessandro Asinardi di San Mariano | |
| 1888 | gen. Antonio Baldissera (I) | ||
| 1889 | 20 december | Baldassare Orero | |
| 1890 | 1 january | Italian colony | |
| 1890 | 30 june | Giacomo Gandolfi | |
| 1892 | 28 february | col. Oreste Baratieri | |
| 1896 | 22 february | gen. Antonio Baldissera (II) | |
| 1897 | 16 december | Ferdinando Martini | |
| 1907 | 25 march | Giuseppe Salvago Raggi | |
| 1915 | 17 august | Giovanni Cherina Ferroni (I) | |
| 1916 | 16 september | Giacomo de Martino | |
| 1919 | 20 july | Camillo de Camillis | |
| 1920 | 20 november | Ludovico Pollera | |
| 1921 | 14 april | Giovanni Cherina Ferroni (II) | |
| 1923 | 1 june | Jacopo Gasparini | |
| 1928 | 1 june | Corrado Zoli | |
| 1930 | 11 july | Riccardo Astuto dei Duchi di Lucchesi | |
| 1935 | 15 january | Ottone Gabeli | |
| 1935 | 18 january | Emilio Giuseppe Gaspar Giovanni de Bono | |
| 1935 | 22 november | Pietro Badoglio | |
| 1936 | 1 june | Alfredo Guzzoni | |
| 1937 | 1 april | Vincenzo De Feo | |
| 1937 | 15 december | Giuseppe Daodice | |
| 1940 | 2 june | Luigi Frusci | |
| 1941 | 5 may | UK occupation | William Platt |
| 1942 | 4 may | Stephen Hemsley Longrigg | |
| 1944 | 9 november | C.D. McCarthy | |
| 1945 | 14 august | John Meredith Benoy | |
| 1946 | 1 november | Francis Greville Drew | |
| 1951 | 19 february | United Nations Trust Territory | Edoardo Matienzo (Bolivia) |