<a href="https://en.wikipedia.org/wiki/Constantinople" id="mwGA" rel="mw:WikiLink" title="Constantinople">Constantinople</a> <a href="https://en.wikipedia.org/wiki/Sack_of_Constantinople" id="mwGQ" rel="mw:WikiLink" title="Sack of Constantinople">falls to the Crusaders</a> of the <a href="https://en.wikipedia.org/wiki/Fourth_Crusade" id="mwGg" rel="mw:WikiLink" title="Fourth Crusade">Fourth Crusade</a>, temporarily ending the <a href="https://en.wikipedia.org/wiki/Byzantine_Empire" id="mwGw" rel="mw:WikiLink" title="Byzantine Empire">Byzantine Empire</a>.<sup about="#mwt20" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-2"}}' id="cite_ref-2" rel="dc:references" typeof="mw:Extension/ref"><a href="./April_13#cite_note-2" id="mwHA" style="counter-reset: mw-Ref 2;"><span class="mw-reflink-text" id="mwHQ">[2]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-2"><cite about="#mwt17" class="citation book cs1" id="CITEREFUniversity_Lecturer_in_History_David_Abulafia1995">University Lecturer in History David Abulafia (1995). <a class="external text" href="https://books.google.com/books?id=bclfdU_2lesC&amp;pg=PA525" id="mwBlA" rel="mw:ExtLink nofollow"><i id="mwBlE">The New Cambridge Medieval History: Volume 5, C.1198-c.1300</i></a>. Cambridge University Press. p.<span id="mwBlI" typeof="mw:Entity"> </span>525. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwBlM" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwBlQ" typeof="mw:Entity"> </span><a href="./Special:BookSources/978-0-521-36289-4" id="mwBlU" rel="mw:WikiLink" title="Special:BookSources/978-0-521-36289-4"><bdi id="mwBlY">978-0-521-36289-4</bdi></a>.</cite><span about="#mwt17" class="Z3988" id="mwBlc" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=The+New+Cambridge+Medieval+History%3A+Volume+5%2C+C.1198-c.1300&amp;rft.pages=525&amp;rft.pub=Cambridge+University+Press&amp;rft.date=1995&amp;rft.isbn=978-0-521-36289-4&amp;rft.au=University+Lecturer+in+History+David+Abulafia&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DbclfdU_2lesC%26pg%3DPA525&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AApril+13"></span></span>