Era
1660-1688
12
17th century
11
20th century
9
1945-1990
7
1969-1974
6
1783-1865
4
1923-
4
1961-1963
4
1974-1977
4
19th century
4
1689-1702
3
1800-1899
3
1815-1871
3
1900-1999
3
1913-1994
3
1933-1945
3
1945-1989
3
1945-1991
3
1960-
3
1968-1989
3
1976-2002
3
Tiananmen Square Incident, 1989
3
1558-1603
2
1633-1701
2
1642-1649
2
1643-1715
2
1649-1660
2
1751-1836
2
1758-1831
2
1789-1815
2
1809-1817
2
1842-1918
2
1865-1921
2
1878-1909
2
1917-1963
2
1945 - 1995
2
1945-1953
2
1946-
2
1985-1995
2
Elizabeth, 1558-1603
2
Velvet Revolution, 1989
2
1517-1648
1
1556-1648
1
1589-1610
1
1603-1625
1
1625-1649
1
1631-1712
1
1648-1789
1
1689-1745
1
16th century
1
more ...