Era
20th century
23
1900-1999
14
21st century
8
1367-1413
7
19th century
7
Henry IV, 1399-1413
7
1770-1827
4
1939-1945
4
Civil War, 1861-1865
4
To 1863
4
1564-1616
3
1600-1899
3
17th century
3
1800-1899
3
18th century
3
World War, 1939-1945
3
-approximately 1540
2
1367-1400
2
1387-1422
2
1421-1471
2
1861-1865
2
1890-1976
2
1946-
2
1965-
2
1973-
2
2000-2099
2
53-44 B.C.
2
Henry V, 1413-1422
2
Henry VI, 1422-1461
2
Revolution, 1775-1783
2
Richard II, 1377-1399
2
-30 B.C.
1
1452-1485
1
1478-1512 or 1513
1
1491-1547
1
1492-1559
1
1600-1775
1
1797-1828
1
1809-1865
1
1813-1897
1
1818-1895
1
1819-1892
1
1832-
1
1832-1888
1
1833-1897
1
1839-1915
1
1841-1904
1
1856-1919
1
1858-1919
1
1863-1877
1
more ...