Era
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1643-1715
51
1874-1965
51
1914-1945
50
2014-
50
Commonwealth and Protectorate, 1649-1660
50
1945-1990
49
Civil War, 1861-1865
49
1558-1603
48
1800-1999
48
1644-1912
46
1979-1997
46
1999-
46
1918-1933
45
Since 1960
45
1625-1649
44
1976-2002
43
2016
42
1889-1945
41
1914-1940
41
1974-
40
1985-
40
James I, 1603-1625
40
Since 2001
40
1648-1714
38
1649-1660
38
1908-1973
38
1603-1625
37
1897-1901
37
1937-2006
37
1953-1985
37
1998-
37
Revolution, 1789-1799
37
1760-1789
36
1760-1820
36
1901-1909
36
1939-1945
36
Louis XIV, 1643-1715
36
1917-1948
35
1984-
35
1992-
35
Since 1979
35
1815-1861
34
1900 - 1999
34
1922-
34
Civil War, 1936-1939
34
Revolution, 1917-1921
34
William and Mary, 1689-1702
34
1900-1945
33
2017-
33
1924-2018
32
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