Era
20th century
15
1225?-1274
12
1724-1804
12
17th century
7
1900-1999
7
354-430
7
19th century
5
600-1500
5
1703-1758
4
18th century
4
1906-1975
4
1939-1945
4
Middle Ages, 600-1500
4
1483-1546
3
1509-1564
2
1542-1621
2
1558-1602
2
1560-1609
2
1646-1716
2
1700-1799
2
1754
2
1800-1899
2
1854-1900
2
1874-1928
2
1898-1963
2
1911-1991
2
1955-
2
340 B.C.-245 B.C.
2
Civil War, 1861-1865
2
To 1500
2
approximately 410-485
2
-1327
1
1185-1600
1
1263-1328
1
1500-1600
1
1535-1600
1
1564-1593
1
1600-1699
1
1603-1714
1
1608-1674
1
1612-1694
1
1638-1715
1
1640-1704
1
1647-1708
1
1657-1736
1
16th century
1
1731-1807
1
1742-1793
1
1775
1
1775-1854
1
more ...