Bremgarten played an important role in the Reformation. An important Swiss reformer called Heinrich Bullinger was born there in 1504. As early as 1529, the official religion of the city changed from Catholicism. However, Catholicism was reintroduced by force in 1531 after the Battle of Kappel. Bullinger was forced into exile and moved to Zürich, where he became the successor of Huldrych Zwingli as the leader of the city after Zwingli had died in battle.
