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| 0604 | Shotoku |  |
| The constitution demands the veneration of Buddha, Buddhist priests & Buddhist laws |
| The Shotoku Taishu code issued by Shotoku forms the basis of a Constitution |
| 1867 | Yoshinobu | |
| The end of Shogun rule, executive power passes to the Emperor |
| 1878 | Mutsuhito | |
| Establishment of Provincial Parliaments |
| 1884 | Meiji | |
| Establishment of an upper House of members of the court nobility, the "Kuge" |
| Royal families receive new titles in a hierarchy of 5 ranks from Prince to Baron |
| 1889 | Itagaki, Taisuke | |
| Helps draft the Meiji Constitution |
| 1889 | Ito | |
| Introduces the Meiji Constitution |
| 1912 | Taisho | |
| Appoints an executive Prime Minister & a 10 man cabinet |
| 1932 | Saito, Makoto | |
| 15th May Party government is effectively brought to an end as the military takes over |
| 1940 | Fumimaro, Konoe | |
| Oct Political parties are banned |
| 1945 | Hirohito | |
| Ceases claming to be a god |
| 1946 | Hirohito | |
| The Emperor is proclaimed "symbol of the state and of the unity of the people" |
| 1st Jan Issues an Imperial Rescript denying his divinity |
| 1st Jan Issues an Imperial Rescript rejecting Japanese racial superiority |
| 1946 | Yoshida, Shigeru | |
| 3rd Nov The new constitution is promulgated |
| 1947 | Hirohito | |
| The new constitution renounces war & abolishes the divinity of the Emperor |
| Under the constitution sovereignty rests in the people, not the Emperor |
| 1947 | Katayama, Tetsu | |
| Under the constitution sovereignty rests in the people, not the Emperor |
| 1947 | Yoshida, Shigeru | |
| 3rd May The new constitution takes effect |
| 1990 | Kaifu, Toshiki | |
| Hawks proposes scrapping the Japanese "peace constitution" |
