<page_title> List of monarchs of Prussia </page_title> <section_title> Duchy of Prussia (1525–1701) </section_title> <table> <cell> Frederick I <col_header> Name </col_header> </cell> <cell> Son of Frederick Wilhelm, also Elector of Brandenburg <col_header> Notes </col_header> </cell> </table>
Frederick I was the elector of Brandenburg and the Duke of Prussia.