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Book chapters
Constitutions, Elections and Legislatures of Poland, 1493-1993 by Jacek Jędruch (1998)

Table 18

TABLE 18 - GEOGRAPHY OF SESSIONS OF THE SEYM
Years Location Number of Seyms Political Entity
1493-1793 Warsaw* 148 Hereditary
Kingdom
and first
Republic
Piotrków 38
Cracow 29
Grodno 11
Lublin 5
Toruñ 3
Radom 2
Sandomierz 1
Bydgoszcz 1
Parczów 1
1653 Brzesc Litewski 1  
1807-1812 Warsaw 2 Duchy of Warsaw
1815-1831 Warsaw* 4 Kingdom of Poland
1827-1845 Poznañ 7 Grand Duchy of Poznañ
1861-1918 Lwów 10 Kingdom of Galicia and Lodomeria
1919-1939 Warsaw 6 Second Republic
1947-1988 Warsaw 10 Polish People's Republic
1989 Warsaw ** Third Republic

Note: In the Hereditary Kingdom the Seym could be held in any place at the discretion of the King, providing the consent of the Senate was obtained.
*In the castle, except the Election Seyms, which were held in the open, in the suburbs of Warsaw at Wola, or at Kamion.
** Elections to the Seym held every 4 years, starting in 1989.