Passauer Vertrag
In March 1629 Emperor Ferdinand II had decreed the Edict of Restitution, by which possessions of Roman Catholic ecclesiastical entities converted after 1552 (Peace of Passau) to Protestantism, Calvinist or Lutheran alike, and acquired before the conversion, and possessions deprived after 1552 from Catholic entities had to be restituted to Catholic institutions. A Jesuit college based in Stade was installed in order to Catholicise the population in the Bremen prince-archbishopric.