Sejm was convened in the end of December 1665. The pre-sejm sejmiks were held in February of 1666. The sejm began its session on 17 March 1666. Jan Chryzostrom Pieniążek, starost [“starostwo” was a Polish term for eldership office] of Oświęcim, became the marshal of the Chamber of Deputies. Against what the king had planned, presented in his writs, which included the set of the most important issues to be dealt with, especially in the scope of national defence, as well as

Sejm was convened at the beginning of year 1659 and the pre-sejm sejmiks were held in February of 1659. The sessions began on on 17 March and were finished, due to postponements, on 30 May 1659. Jan Gniński, starost [“starostwo” was a Polish term for eldership office] of Gniezno, was elected the marshal of the Chamber of Deputies. Lots of attention was given to approving the Treaty of Hadiach, signed with the Cossacks on 16 September 1658). Sejm adopted many resolutions