As the appellate court of Brandenburg-Prussia and the Kingdom of Prussia from 1701, it was since 1698 based in the central Cölln quarter of Berlin. In 1735, under the rule of King Frederick William I, it moved to the newly erected Baroque "Collegienhaus" in the Friedrichstadt district (in present-day Kreuzberg). It then housed the supreme courts and judges of the different territories ruled in personal union by the royal House of Hohenzollern, without formally merging the different juridical systems. By that concentration in one locality, the later unification of the juridical systems was prepared. The "Collegienhaus" is today part of the Jewish Museum Berlin.