Marshal of the Sejm
A sejm began with a solemn mass, a verification of deputies mandates, and election of the Marshal of the Sejm (also known as the Speaker). (The position of the Marshal of the Sejm (and sejmik) who presided over the proceedings and was elected from the body of deputies evolved in the 17th century.) Next, the kanclerz (chancellor) declared the king's intentions to both chambers, who would then debate separately till the ending ceremonies.