After "John Frederick's" death in 1634 Chapter and Estates regarded Frederick's (later Danish Crown Prince) dismissal as coadjutor by Ferdinand II by virtue of the "Edict of Restitution" illegitimate. But the Swedish occupants had to be persuaded first, to accept "Frederick's" succession. So Chapter and Estates ruled the Prince-Archbishopric until the conclusion of the negotiations with Sweden. In 1635 he succeeded as Lutheran Administrator Frederick II in the Sees of Bremen and of Verden. But he had to render homage to the minor Queen Christina of Sweden.