The Protestant city of Zürich declares war on June 8, 1529, leading to the First War of Kappel in Switzerland. The war was triggered by the execution of Protestant pastor, Jacob Kaiser, who was burned at the stake for heresy in the Catholic canton of Schwyz in May 1529.
A peace treaty favorable to the Protestants was signed dissolving the Catholic alliance with the Austrian Habsburgs and allowing the Reformation to spread in shared territories. However, tensions remained high, eventually leading to the Second War of Kappel in 1531.
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