Era
20th century
80
1939-1945
55
1900-1999
45
1945-1992
22
1918-1945
17
21st century
17
1945-
16
1980-1989
15
To 1500
15
1945-1980
14
To 1572
14
19th century
13
1989-
12
20e siècle
12
1938-1945
11
To 1526
11
16th century
10
17th century
10
2000-2099
9
Since 1945
9
Intervention, 1968
7
Revolution, 1863-1864
7
1800-1999
6
1939 - 1945
6
1945-1981
6
1945-1989
6
1990-
6
18th century
5
1980-
5
Jagellons, 1386-1572
5
Piast period, 960-1386
5
1600-1699
4
1900-2099
4
1914-1918
4
1993-
4
Middle Ages, 600-1500
4
Occupation, 1939-1945
4
Sigismund III, 1587-1632
4
1138-1305
3
1271-1305
3
1386-1572
3
1415-1480
3
1500-1599
3
1526-1618
3
1908-1974
3
1918-1938
3
1929-
3
1945 - 1992
3
1968-1989
3
1981-1990
3
more ...