Era
20th century
10
-approximately 1540
3
1917-1970
3
1927-1978
3
19th century
3
Civil War, 1861-1865
3
1749-1832
2
1801-1917
2
1860-1904
2
1888-1954
2
1910-1986
2
1917-1945
2
1949-1976
2
Civil War, 1936-1939
2
Nicholas II, 1894-1917
2
Revolution, 1905-1907
2
Revolution, 1917-1921
2
1430 or 31-1476 or 7
1
1452-1485
1
1483-1546
1
1530-1584
1
1564-1593
1
1564-1642
1
1572
1
1712-1795
1
1801-1836
1
1806-1881
1
1809-1849
1
1809-1865
1
1830-1886
1
1842-1911
1
1847-1931
1
1857-1938
1
1861-1877
1
1861-1938
1
1862-1954
1
1864-1948
1
1869-1916
1
1870-1924
1
1874-1942
1
1874-1943
1
1874-1946
1
1875-1948
1
1875-1961
1
1882-1941
1
1882-1946
1
1883-1927
1
1885-1930
1
1887-1945
1
1887-1985
1
more ...