The <a href="https://en.wikipedia.org/wiki/Treaty_of_Constantinople_(1800)" id="mwUw" rel="mw:WikiLink" title="Treaty of Constantinople (1800)">Treaty of Constantinople</a> establishes the <a href="https://en.wikipedia.org/wiki/Septinsular_Republic" id="mwVA" rel="mw:WikiLink" title="Septinsular Republic">Septinsular Republic</a>, the first autonomous Greek state since the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Fall_of_the_Byzantine_Empire" id="mwVQ" rel="mw:WikiLink" title="Fall of the Byzantine Empire">Fall of the Byzantine Empire</a>. (Under the <a href="https://en.wikipedia.org/wiki/Old_Style_and_New_Style_dates" id="mwVg" rel="mw:WikiLink" title="Old Style and New Style dates">Old Style</a> calendar then still in use in the Ottoman Empire, the treaty was signed on 21 March.)<sup about="#mwt42" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-6"}}' id="cite_ref-6" rel="dc:references" typeof="mw:Extension/ref"><a href="./April_6#cite_note-6" id="mwVw" style="counter-reset: mw-Ref 6;"><span class="mw-reflink-text" id="mwWA">[6]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-6"><cite about="#mwt36" class="citation book cs1" id="CITEREFGekas2017">Gekas, Sakis (2017). <a class="external text" href="https://books.google.com/books?id=J2joCwAAQBAJ" id="mwB7k" rel="mw:ExtLink nofollow"><i id="mwB7o">Xenocracy: State, Class, and Colonialism in the Ionian Islands, 1815-1864</i></a>. New York: Berghahn. pp.<span id="mwB7s" typeof="mw:Entity"> </span>23–24. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwB7w" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwB70" typeof="mw:Entity"> </span><a href="./Special:BookSources/9781785332616" id="mwB74" rel="mw:WikiLink" title="Special:BookSources/9781785332616"><bdi id="mwB78">9781785332616</bdi></a></cite><span about="#mwt36" class="Z3988" id="mwB8A" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Xenocracy%3A+State%2C+Class%2C+and+Colonialism+in+the+Ionian+Islands%2C+1815-1864&amp;rft.place=New+York&amp;rft.pages=23-24&amp;rft.pub=Berghahn&amp;rft.date=2017&amp;rft.isbn=9781785332616&amp;rft.aulast=Gekas&amp;rft.aufirst=Sakis&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DJ2joCwAAQBAJ&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AApril+6"></span>; <link about="#mwt39" data-mw='{"name":"templatestyles","attrs":{"src":"Module:Citation/CS1/styles.css"},"body":{"extsrc":""},"parts":[{"template":{"target":{"wt":"cite book","href":"./Template:Cite_book"},"params":{"last":{"wt":"Mackridge"},"first":{"wt":"Peter"},"chapter":{"wt":"Introduction"},"title":{"wt":"The Ionian Islands: Aspects of their History and Culture"},"editor-last1":{"wt":"Hirst"},"editor-first1":{"wt":"Anthony"},"editor-last2":{"wt":"Sammon"},"editor-first2":{"wt":"Patrick"},"location":{"wt":"Newcastle upon Tyne, UK"},"publisher":{"wt":"Cambridge Scholars Publishing"},"year":{"wt":"2014"},"isbn":{"wt":"9781443862783"},"url":{"wt":"https://books.google.com/books?id=CdIxBwAAQBAJ"},"page":{"wt":"5"}},"i":0}}]}' href="mw-data:TemplateStyles:r1215172403" id="mwB8E" rel="mw-deduplicated-inline-style" typeof="mw:Extension/templatestyles mw:Transclusion"/><cite about="#mwt39" class="citation book cs1" id="CITEREFMackridge2014">Mackridge, Peter (2014). "Introduction". In Hirst, Anthony; Sammon, Patrick (eds.). <a class="external text" href="https://books.google.com/books?id=CdIxBwAAQBAJ" id="mwB8I" rel="mw:ExtLink nofollow"><i id="mwB8M">The Ionian Islands: Aspects of their History and Culture</i></a>. Newcastle upon Tyne, UK: Cambridge Scholars Publishing. p.<span id="mwB8Q" typeof="mw:Entity"> </span>5. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwB8U" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwB8Y" typeof="mw:Entity"> </span><a href="./Special:BookSources/9781443862783" id="mwB8c" rel="mw:WikiLink" title="Special:BookSources/9781443862783"><bdi id="mwB8g">9781443862783</bdi></a>.</cite><span about="#mwt39" class="Z3988" id="mwB8k" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Introduction&amp;rft.btitle=The+Ionian+Islands%3A+Aspects+of+their+History+and+Culture&amp;rft.place=Newcastle+upon+Tyne%2C+UK&amp;rft.pages=5&amp;rft.pub=Cambridge+Scholars+Publishing&amp;rft.date=2014&amp;rft.isbn=9781443862783&amp;rft.aulast=Mackridge&amp;rft.aufirst=Peter&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DCdIxBwAAQBAJ&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AApril+6"></span></span>