question: Which areas of Northern Europe practiced those religions?
sentence: Nearly 50,000 Huguenots established themselves in Germany, 20,000 of whom were welcomed in Brandenburg-Prussia, where they were granted special privileges (Edict of Potsdam) and churches in which to worship (such as the Church of St. Peter and St. Paul, Angermünde) by Frederick William, Elector of Brandenburg and Duke of Prussia.