Ambrosius Blarer

In February 1525, Blarer started preaching in Konstanz and he soon became a leading figure of the local Reformation.

The Tetrapolitan Confession was also signed by Strasbourg (Bucer was its author) and by Memmingen and Ulm, two cities for which Blarer was the main reformer.

The best known among them included: Philip Melanchthon, Huldrych Zwingli, John Calvin, Martin Bucer, Heinrich Bullinger, Andreas Karlstadt and Johannes Oecolampadius.

Unlike the other members of the Schmalkaldic League, Constance had refused to negotiate with Emperor Charles V unless they could obtain the right to keep the Protestant faith.

This ended in the battle at the city gates on August 6, 1548, which Constance lost, but to prevent further losses, the council finally had to agree to the Emperor‘s conditions.

Because they had refused negotiations for so long, they were not only forced to abandon their Protestant faith, but also lost their title of Imperial Free City and became subject to Catholic Habsburg Austria.