The Great Elector, Frederick William, also kept a court Jew at Berlin, Israel Aaron (1670), who by his influence tried to prevent the influx of foreign Jews into the Prussian capital.
There were court Jews at all the petty German courts; e.g., Zacharias Seligmann (1694) in the service of the Prince of Hesse-Homburg, and others in the service of the dukes of Mecklenburg.