January 18, 1493
First General Sejm in Piotrków
The First General Sejm was convened on January 18, 1493, in Piotrków by King John I Albert. This event marked the beginning of Polish parliamentarism, introducing a bicameral parliamentary system consisting of the Senate and the Chamber of Deputies. During the session, 33 parliamentary constitutions were enacted, which shaped the foundations of the Polish political system.
