Era
20th century
147
Revolution, 1917-1921
72
1900-1999
69
19th century
62
1900 - 1999
33
Revolution, 1905-1907
33
1991-
28
1917-1921
27
1917 - 1921
24
1800-1899
22
Since 1991
19
1894-1917
15
1939-1945
15
1917-
14
1985-1991
12
To 1917
12
1905-1907
11
21st century
11
February Revolution, 1917
11
1800-1999
10
1870-1924
8
1917-1945
8
1800 - 1999
7
1861-1917
7
1917-1936
7
1800 - 1899
6
2000-2099
6
Nicholas II, 1894-1917
6
1904-1914
5
1939 - 1945
5
Siege, 1941-1944
5
1801-1917
4
18th century
4
1985 - 1991
4
20e siècle
4
Revolution of 1905
4
Since 1917
4
1700-1799
3
1856-1918
3
1905 - 1907
3
1917-1928
3
1689-1801
2
1800-1900
2
1828-1910
2
1861 - 1917
2
1885
2
1905
2
1914-1918
2
1917 - 1928
2
1917 - 1945
2
more ...