| YEAR | DATE | EVENT | PRIME MINISTER | GOVERNOR |
| 1889 | 3 august | Italian protectorate | Vincenzo Filonardi | |
| 1897 | Ernesto Dulio | |||
| 1897 | Giorgio Sorrentino | |||
| 1898 | 25 may | Emilio Dulio | ||
| 1905 | 16 march | Italian colony | Luigi Mercatelli | |
| 1906 | Giuseppe Salvago Raggi | |||
| 1907 | T. Carletti | |||
| 1910 | 1 july | Italian crown colony | Giacomo De Martino | |
| 1916 | Giovanni Cherina-Ferroni | |||
| 1920 | 21 june | Carlo Ricci | ||
| 1923 | 8 december | Cesare Maria De Vecchi | ||
| 1928 | 1 june | Guido Corni | ||
| 1931 | 1 july | Maurizio Rava | ||
| 1935 | 6 march | Rodolfo Graziani | ||
| 1936 | 22 may | Angelo De Ruben | ||
| 1936 | 24 may | Ruggiero Santini | ||
| 1937 | 15 december | Francesco Saveno Caroselli | ||
| 1940 | 11 june | Gustavo Pesenti | ||
| 1940 | 31 december | Carlo De Simone | ||
| 1941 | 9 march | UK Occupation | Reginald H. Smith | |
| 1941 | William Eric Halstead Scuphan | |||
| 1943 | Denis Henry Widcham | |||
| 1948 | Eric Armar Vally de Candole | |||
| 1948 | Geoffrey Massey Gamble | |||
| 1949 | 21 november | Giovanni Fornari | ||
| 1950 | 1 april | Italian Trust Territory | Giovanni Fornari | |
| 1954 | Enrico Martino | |||
| 1954 | Abdullahi Isa Muhammad | |||
| 1957 | Enrico Anzilotti | |||
| 1958 | Mario De Stefano |