In the same year, 1607, the Catholic majority of the Reichstag meeting in the Diet of Augsburg resolved that the renewal of the Peace of Augsburg of 1555 should be conditional on the restoration of all church land appropriated since 1552. Acting on these events, the Protestant princes formed a military alliance on 14 May 1608, the Protestant Union, whose leader was Frederick IV of Wittelsbach, the Elector Palatine.
