Columbia subject headings:
Friedrich Wilhelm, Elector of Brandenburg, 1620-1688.
Prussia (Germany)--History--Frederick William, the Great Elector, 1640-1688.
Harvard subject headings:
Friedrich Wilhelm, Elector of Brandenburg, 1620-1688
Prussia (Germany)--History--Frederick William, the Great Elector, 1640-1688.
Prussia (Germany)--Kings and rulers--Biography.
Princeton subject headings:
Friedrich Wilhelm, Elector of Brandenburg, 1620-1688.
Prussia (Germany)--History--Frederick William, the Great Elector, 1640-1688.