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In page Huldrych Zwingli:

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As Zwingli was working on establishing these political alliances, Charles V, the Holy Roman Emperor, invited Protestants to the Augsburg Diet to present their views so that he could make a verdict on the issue of faith. The Lutherans presented the Augsburg Confession. Under the leadership of Martin Bucer, the cities of Strasbourg, Constance, Memmingen, and Lindau produced the Tetrapolitan Confession. This document attempted to take a middle position between the Lutherans and Zwinglians.[citation needed]