 After Frederick III, Elector of Saxony concealed Luther at the Wartburg (1521–1522), Karlstadt and Thomas Müntzer started the first iconoclastic movement in Wittenberg and preached theology that was viewed as Anabaptist, but Bodenstein and Müntzer never regarded themselves as Anabaptists.Karlstadt operated as a church reformer largely in his own right, and after coming in conflict with Luther, he switched his allegiance from the Lutheran to the Reformed camp, and later became a radical reformer before once again returning to the Reformed tradition.First, he served as one of many Lutheran preachers in Wittenberg.