Era
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1909-1984
1
1910-1936
1
1910-1945
1
1914-1940
1
1915-2000
1
1915-2003
1
1915-2010
1
1917-
1
1917-1945
1
1917-1954
1
1917-1996
1
1918-1933
1
1918-1945
1
1918-1990
1
1919-2013
1
1925-
1
1928-
1
1929-2010
1
1938-
1
1939-1949
1
1944-1989
1
1944-1990
1
1945-1976
1
1945-1990
1
1947-
1
1948-1960
1
1948-1961
1
1949-
1
1949-1976
1
1961-1975
1
1961-1978
1
1965-
1
1985-1991
1
21st century
1
Boris III, 1918-1943
1
Civil War, 1944-1949
1
Republic, 1912-1949
1
Revolution, 1917-1921
1
Revolution, 1923-1924
1
Revolution, 1954-1962
1
Since 1900
1
Since 1947
1
Transfer of Sovereignty from Great Britain, 1997
1
approximately 1903-1971
1
approximately 1903-1998
1
d. 1989
1