<page_title> List of legendary kings of Britain </page_title> <section_title> Kings derived from Geoffrey of Monmouth </section_title> <table> <cell> Trahern <col_header> Kingdom </col_header> <col_header> England </col_header> <col_header> Scotland </col_header> <col_header> Wales </col_header> <col_header> Cornwall </col_header> </cell> </table>
Trahern is a legendary King of the Britons in Geoffrey of Monmouth.