<page_title> Nicholas Mystikos </page_title> <section_title> Sources </section_title> <table> <cell> Patriarch of Constantinople 901–907 <col_header> Titles of Chalcedonian Christianity </col_header> </cell> <cell> Patriarch of Constantinople 912–925 <col_header> Titles of Chalcedonian Christianity </col_header> </cell> </table>
Nicholas I Mystikos was the Patriarch of Constantinople from 901 to 907 and from 912 to 925.