Era
1801-1917
30
20th century
20
19th century
18
1894-1917
15
1800-1917
10
1689-1801
7
Revolution, 1917-1921
7
1801-1999
6
1894-1999
6
1900-1999
6
1904-1914
6
1800-1899
5
1870-1924
5
1917-1936
5
1991-
5
Since 1991
4
17th century
3
1861-1917
3
February Revolution, 1917
3
Revolution, 1905-1907
3
To 1867
3
1600-1699
2
1613-1689
2
1672-1725
2
1689-1917
2
16th century
2
1801-1900
2
1801-1921
2
1855-1881
2
18th century
2
21st century
2
Nicholas II, 1894-1917
2
Peter I, 1689-1725
2
1288-1918
1
1462-1605
1
1500-1613
1
1500-1799
1
1530-1584
1
1533-1613
1
1681-1736
1
1689-1725
1
1745-1819
1
1775-1917
1
1789-1900
1
1789-1917
1
1796-1918
1
1800-1999
1
1801-1936
1
1812-1870
1
1821-1881
1
more ...