The <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Fourth_Council_of_Constantinople_(Roman_Catholic)" id="mwHQ" rel="mw:WikiLink" title="Fourth Council of Constantinople (Roman Catholic)">Fourth Council of Constantinople</a> is convened to depose patriarch Photios I.<sup about="#mwt25" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-3"}}' id="cite_ref-3" rel="dc:references" typeof="mw:Extension/ref"><a href="./October_5#cite_note-3" id="mwHg" style="counter-reset: mw-Ref 3;"><span class="mw-reflink-text" id="mwHw">[3]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-3"><cite about="#mwt22" class="citation book cs1" id="CITEREFRaymond_Davis1995">Raymond Davis (1995). <a class="external text" href="https://books.google.com/books?id=q7EuWhDYxM4C&amp;pg=PA252" id="mwBvg" rel="mw:ExtLink nofollow"><i id="mwBvk">The Lives of the Ninth-century Popes (Liber Pontificalis): The Ancient Biographies of Ten Popes from A.D. 817-891</i></a>. Liverpool University Press. p.<span id="mwBvo" typeof="mw:Entity"> </span>252. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwBvs" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwBvw" typeof="mw:Entity"> </span><a href="./Special:BookSources/978-0-85323-479-1" id="mwBv0" rel="mw:WikiLink" title="Special:BookSources/978-0-85323-479-1"><bdi id="mwBv4">978-0-85323-479-1</bdi></a>.</cite><span about="#mwt22" class="Z3988" id="mwBv8" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=The+Lives+of+the+Ninth-century+Popes+%28Liber+Pontificalis%29%3A+The+Ancient+Biographies+of+Ten+Popes+from+A.D.+817-891&amp;rft.pages=252&amp;rft.pub=Liverpool+University+Press&amp;rft.date=1995&amp;rft.isbn=978-0-85323-479-1&amp;rft.au=Raymond+Davis&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3Dq7EuWhDYxM4C%26pg%3DPA252&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AOctober+5"></span></span>