Emperor <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Otto_I,_Holy_Roman_Emperor" id="mwEQ" rel="mw:WikiLink" title="Otto I, Holy Roman Emperor">Otto I</a> and Pope <a href="https://en.wikipedia.org/wiki/Pope_John_XII" id="mwEg" rel="mw:WikiLink" title="Pope John XII">John XII</a> co-sign the <i id="mwEw"><a href="https://en.wikipedia.org/wiki/Diploma_Ottonianum" id="mwFA" rel="mw:WikiLink" title="Diploma Ottonianum">Diploma Ottonianum</a></i>, recognizing John as ruler of <a href="https://en.wikipedia.org/wiki/Rome" id="mwFQ" rel="mw:WikiLink" title="Rome">Rome</a>.<sup about="#mwt15" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-1"}}' id="cite_ref-1" rel="dc:references" typeof="mw:Extension/ref"><a href="./February_13#cite_note-1" id="mwFg" style="counter-reset: mw-Ref 1;"><span class="mw-reflink-text" id="mwFw">[1]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-1"><cite about="#mwt12" class="citation book cs1" id="CITEREFKirsch1910">Kirsch, Johann Peter (1910). "John XIII". In Herbermann, Charles G.; Pace, Edward A; Pallen, Condé B.; Shahan, Thomas J.; Wynne, John J. (eds.). <a class="external text" href="https://books.google.com/books?id=4HkqAAAAMAAJ" id="mwBr0" rel="mw:ExtLink nofollow"><i id="mwBr4">The Catholic Encyclopedia. Vol. 8</i></a>. New York: Encyclopedia Press. p.<span id="mwBr8" typeof="mw:Entity"> </span>427. <a class="mw-redirect" href="./OCLC_(identifier)" id="mwBsA" rel="mw:WikiLink" title="OCLC (identifier)">OCLC</a><span id="mwBsE" typeof="mw:Entity"> </span><a class="external text" href="https://www.worldcat.org/oclc/13551132" id="mwBsI" rel="mw:ExtLink nofollow">13551132</a>.</cite><span about="#mwt12" class="Z3988" id="mwBsM" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=John+XIII&amp;rft.btitle=The+Catholic+Encyclopedia.+Vol.+8&amp;rft.place=New+York&amp;rft.pages=427&amp;rft.pub=Encyclopedia+Press&amp;rft.date=1910&amp;rft_id=info%3Aoclcnum%2F13551132&amp;rft.aulast=Kirsch&amp;rft.aufirst=Johann+Peter&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3D4HkqAAAAMAAJ&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AFebruary+13"></span></span>