Era
20th century
67
1910-1921
29
19th century
25
17th century
17
1922-
17
1649-1775
16
1837-1901
15
Commonwealth and Protectorate, 1649-1660
15
James II, 1685-1688
12
1922-1949
11
18th century
10
1969-1994
9
1879-1916
7
Easter Rising, 1916
7
1858-1916
6
1868-1916
6
1878-1916
6
1881-1916
6
1883-1916
6
1887-1916
6
William and Mary, 1689-1702
6
1810-1820
5
1901-1910
5
1969-
5
1650-1702
4
1660-1688
4
1688-1689
4
1769-1852
4
1800-1837
4
1872-1949
4
1882-1975
4
1968-1998
4
Charles I, 1625-1649
4
Civil War, 1642-1649
4
Partition, 1921
4
War of Independence, 1919-1921
4
1603-1714
3
1625-1649
3
1633-1701
3
1649-1660
3
1660-1690
3
1760-1820
3
1775-1847
3
1831-1840
3
1874-1965
3
1879-1920
3
1994-
3
21st century
3
Civil War, 1922-1923
3
Medieval period, 1066-1485
3
more ...