Era
20th century
15
1939-1945
13
19th century
9
1899-1973
5
1918-1945
4
1933-1945
4
1939-1975
4
1945-1955
4
German occupation, 1940-1945
4
Occupation, 1939-1945
4
-approximately 1430
3
1237-1480
3
1530-1584
3
1899-1961
3
1900-1999
3
1945-
3
Ivan IV, 1533-1584
3
1182-1226
2
16th century
2
1809-1865
2
1843-1914
2
1847-1882
2
1862-1892
2
1883-1945
2
1883-1957
2
1889-1945
2
1889-1968
2
1890-1976
2
1896-1940
2
1901-1973
2
1903-1967
2
1904-1991
2
1914-1945
2
1914-2000
2
1918-2006
2
1921-1977
2
1926-
2
1927-2015
2
1928-1967
2
1929
2
1932-1995
2
1942-
2
Revolution, 1959
2
To 1912
2
Uprising, 1944
2
-1612?
1
-30 B.C.
1
-459
1
1220-1263
1
1333-1600
1
more ...