Era
20th century
42
1900-1999
30
1939-1945
28
Revolution, 1917-1921
20
Siege, 1941-1944
19
1925-1953
16
1917-1921
12
1801-1917
11
21st century
11
1991-
9
Nicholas II, 1894-1917
9
18th century
8
1941-1944
8
17th century
6
1939 - 1945
6
19th century
6
Peter I, 1689-1725
6
1689-1799
5
2000-2099
5
Since 1991
5
1689-1801
4
1878-1953
4
1900 - 1999
4
1917-1921 (Révolution)
4
1970-1991
4
Revolution, 1905-1907
4
1600-1699
3
1672-1725
3
1905-1907
3
1917 - 1921
3
1917-1945
3
1917-1970
3
1925 - 1953
3
1941-1944 (Siège)
3
German occupation, 1941-1944
3
October Crisis, 1993
3
1800 - 1899
2
1800-1899
2
1855-1881
2
1861-1937
2
1879-1964
2
1894 - 1917
2
1894-1917
2
1894-1917 (Nicolas II)
2
1906-1975
2
1917-1936
2
1918-1945
2
1926-2006
2
1936-1953
2
1985-1991
2
more ...