Era
20th century
83
19th century
27
1969-1974
19
18th century
18
1945-
12
1960-1980
10
1945-1989
7
1958-
7
21st century
6
17th century
5
1918-1933
5
1944-
5
1961-1969
5
1963-1969
5
1837-1901
4
1931-
4
1964-1979
4
1965-1975
4
1970-
4
Revolution, 1775-1783
4
1960-1970
3
1989-
3
1775-1783
2
1780-1842
2
1788-1872
2
1901-1936
2
1918-1945
2
1950-
2
1955-1965
2
1994-
2
Alexander II, 1855-1881
2
Nicholas I, 1825-1855
2
Revolution, 1789-1799
2
1564-1616
1
1608-1674
1
1642-1660
1
1649-1660
1
1660-1688
1
1660-1714
1
1740-1824
1
1750-1814
1
1750-1814,
1
1757-1827
1
1759 or 60-1843
1
1760-1820
1
1764-1834
1
1770-1850
1
1772-1834
1
1792-1878
1
1797-1874
1
more ...