The sejm was called by the king Sigismund I in October 1541 to be held on 6 January 1533 in Piotrków. The pre-sejm sejmiks were held at the end of 1541. Because of the widespread epidemic, also in the planned sejm meeting place, the sessions were postponed to 5 March 1542. The sejm debated in the king’s absence, who, being ill, resided in Lithuania till May 1542. The king was represented by two legates: castellan of Lublin, Bernard Maciejowski and canon of Cracow, Andrzej

Sejm was convened in December 1669, after the king Michał Korybut Wiśniowiecki was elected. The sejmiks were held in January and February of 1670. This sejm began its sessions on 5 March 1670. The marshal of the Chamber of Deputies became Jan Kazimierz Kierdey, marshal of Grodno. The problem raised during the proceedings, was the matter of keeping the exiles safe, that is the refugees fleeing from the war-stricken areas of Ukraine. Sejm became also the central stage for the conflict