Era
20th century
63
Revolution, 1917-1921
62
1939-1945
59
1991-
42
Civil War, 1994-
33
1900-1999
29
19th century
29
1917-1921
28
21st century
27
1925-1953
24
1860-1904
21
1917-1970
18
Since 1991
18
1828-1910
16
2000-2099
16
1799-1837
14
1801-1917
14
1800-1899
13
Siege, 1941-1944
13
1953-1985
11
1936-1953
10
1821-1881
9
1970-1991
9
Alexander I, 1801-1825
9
Since 1994
9
1800-1825
8
1891-1940
7
1962-1990
7
Nicholas II, 1894-1917
7
1809-1852
6
Revolution, 1905-1907
6
To 1917
6
1237-1480
5
1530-1584
5
1533-1917
5
1769-1821
5
1868-1936
5
1883-1945
5
1894-1917
5
1904-1914
5
1917-1936
5
1985-1991
5
1868-1918
4
1869-1916
4
1938-1993
4
1942-1943
4
Alexander III, 1881-1894
4
German occupation, 1941-1944
4
-1775
3
-approximately 1430
3
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