The Sejm was convoked in October 1629. Pre-Sejm Sejmiks were held in the same month, and in November 1629. Sessions opened on November 13th 1629. Legal Secretary of Lithuania Stefan Pac was elected Speaker. Following a tempestuous discussion associated with unfavourable decisions (leaving all harbours east of Gdańsk – Livonia to River Dźwina – to the Swedes; levying additional customs duties on Prussian harbours; and sequestering Malbork, Sztum, and Głowa for George William,