In 1815 Swedish Pomerania became a pawn in the hands of the powerful, Sweden ceded it to Denmark which passed it on to Prussia in exchange for Saxe-Lauenburg. Swedish Pomerania was renamed as New Hither Pomerania (Neuvorpommern). In 1817 the supreme governor of the Lutheran State Church and the Reformed State Church in Prussia, Frederick William III, initiated the merger of both churches to form the Evangelical Church in Prussia, avoiding in its name the terms Lutheran or Reformed. This new state church, an administratively united umbrella comprising Lutheran, Reformed (Calvinist) and United Protestant congregations, built up regional subdivisions, so-called ecclesiastical provinces (Kirchenprovinzen).