The <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Crusaders" id="mwLg" rel="mw:WikiLink" title="Crusaders">Crusaders</a> of the <a href="https://en.wikipedia.org/wiki/Fourth_Crusade" id="mwLw" rel="mw:WikiLink" title="Fourth Crusade">Fourth Crusade</a> breach the walls of <a href="https://en.wikipedia.org/wiki/Constantinople" id="mwMA" rel="mw:WikiLink" title="Constantinople">Constantinople</a> and <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Siege_of_Constantinople_(1204)" id="mwMQ" rel="mw:WikiLink" title="Siege of Constantinople (1204)">enter the city</a>, which they completely occupy the following day.<sup about="#mwt30" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-4"}}' id="cite_ref-4" rel="dc:references" typeof="mw:Extension/ref"><a href="./April_12#cite_note-4" id="mwMg" style="counter-reset: mw-Ref 4;"><span class="mw-reflink-text" id="mwMw">[4]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-4"><cite about="#mwt27" class="citation book cs1" id="CITEREFClaster2009">Claster, Jill N. (2009). <a class="external text" href="https://books.google.com/books?id=JP6OzSDQJlwC" id="mwB04" rel="mw:ExtLink nofollow"><i id="mwB08">Sacred Violence: The European Crusades to the Middle East, 1095-1396</i></a>. Toronto: University of Toronto Press. p.<span id="mwB1A" typeof="mw:Entity"> </span>214. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwB1E" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwB1I" typeof="mw:Entity"> </span><a href="./Special:BookSources/9781442600584" id="mwB1M" rel="mw:WikiLink" title="Special:BookSources/9781442600584"><bdi id="mwB1Q">9781442600584</bdi></a>.</cite><span about="#mwt27" class="Z3988" id="mwB1U" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Sacred+Violence%3A+The+European+Crusades+to+the+Middle+East%2C+1095-1396&amp;rft.place=Toronto&amp;rft.pages=214&amp;rft.pub=University+of+Toronto+Press&amp;rft.date=2009&amp;rft.isbn=9781442600584&amp;rft.aulast=Claster&amp;rft.aufirst=Jill+N.&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DJP6OzSDQJlwC&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AApril+12"></span></span>