<page_title> List of rulers of Brandenburg </page_title> <section_title> Margraves and Electors of Brandenburg </section_title> <table> <cell> Otto I <col_header> Ascanian Dynasty </col_header> <col_header> Name </col_header> </cell> <cell> 1170–1184 <col_header> Ascanian Dynasty </col_header> <col_header> Reign </col_header> </cell> </table>
Otto I was the second Margrave of Brandenburg, beginning his reign in 1170.