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In page Huldrych Zwingli:

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Zwingli again took the lead in the disputation. His opponent was the aforementioned canon, Konrad Hofmann, who had initially supported Zwingli's election. Also taking part was a group of young men demanding a much faster pace of reformation, who among other things pleaded for replacing infant baptism with adult baptism. This group was led by Conrad Grebel, one of the initiators of the Anabaptist movement. During the first three days of dispute, although the controversy of images and the mass were discussed, the arguments led to the question of whether the city council or the ecclesiastical government had the authority to decide on these issues.[citation needed]