Having usurped the throne of <a href="https://en.wikipedia.org/wiki/Emperor_Gong_of_Jin" id="mwGg" rel="mw:WikiLink" title="Emperor Gong of Jin">Emperor Gong of Jin</a>, <a href="https://en.wikipedia.org/wiki/Emperor_Wu_of_Song" id="mwGw" rel="mw:WikiLink" title="Emperor Wu of Song">Liu Yu</a> proclaims himself <a href="https://en.wikipedia.org/wiki/List_of_emperors_of_the_Southern_dynasties" id="mwHA" rel="mw:WikiLink" title="List of emperors of the Southern dynasties">Emperor</a> of the <a href="https://en.wikipedia.org/wiki/Liu_Song_dynasty" id="mwHQ" rel="mw:WikiLink" title="Liu Song dynasty">Liu Song dynasty</a>.<sup about="#mwt12" 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="./July_10#cite_note-1" id="mwHg" style="counter-reset: mw-Ref 1;"><span class="mw-reflink-text" id="mwHw">[1]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-1">According to Liu Yu's biography in <i id="mwB2A">Book of Song</i>, he crowned himself emperor on the <i id="mwB2E">dingmao</i> day of the 6th month of the 1st year of the <i id="mwB2I">Yongchu</i> era of his reign. This corresponds to 10 Jul 420 in the Julian calendar. (永初元年夏六月丁卯，設壇於南郊，即皇帝位...) <i id="mwB2M"><a class="mw-redirect" href="./Song_Shu" id="mwB2Q" rel="mw:WikiLink" title="Song Shu">Song Shu</a></i>, vol. 03</span>