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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1910 | 8 january | UK Protectorate | king Ugyen Wangchuk | Raja Ugyen Dorji |
| 1917 | Raja Sonam Tobgay Dorji | |||
| 1926 | 21 august | king Jigme Wangchuk |
| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1949 | 8 august | Indian Protectorate | ||
| 1952 | 27 october | king Jigme Dorji Wangchuk | Jigme Palden Dorji | |
| 1964 | july | Lhendup Dorji | ||
| 1964 | 27 november | - |