Era
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1857-1924
6
1938-
6
German occupation, 1941-1944
6
Revolution, 1830-1832
6
Since 1945
6
Since 1980
6
1566-1632
5
1860-1941
5
1900-1944
5
1913-1994
5
1925-
5
1943
5
1945-1991
5
Elective monarchy, 1572-1763
5
Revolution, 1775-1783
5
Revolution, 1905-1907
5
Sigismund III, 1587-1632
5
Stanislaus II Augustus, 1764-1795
5
1500-1599
4
1595-1648
4
1600-1699
4
1700-1899
4
1746-1817
4
1763-1796
4
1795-1918
4
1881-1943
4
1917-
4
1917-1991
4
1918-
4
1920-2005
4
1922-1951
4
1923-
4
1924-
4
1931-
4
1938-1945
4
Casimir IV, 1447-1492
4
Since 1900
4
Since 1981
4
1043-1081
3
1453-1683
3
1670-1733
3
1798-1855
3
1830-1864
3
1859-1906
3
1878-1957
3
1880-1942
3
1880-1950
3
1905-1907
3
1908-1974
3
1910-2008
3
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