Frederick William, known as the " Great Elector ", who had succeeded his father George William as ruler in 1640, initiated a policy of promoting immigration and religious tolerance.

Frederick William, known as " The Great Elector ", opened Brandenburg-Prussia to large-scale immigration (" Peuplierung ") of mostly Protestant refugees from all across Europe (" Exulanten "), most notably Huguenot immigration following the Edict of Potsdam.

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