The oldest recorded eruption of <a href="https://en.wikipedia.org/wiki/Mount_Fuji" id="mwFw" rel="mw:WikiLink" title="Mount Fuji">Mount Fuji</a> (Traditional <a href="https://en.wikipedia.org/wiki/Japanese_calendar" id="mwGA" rel="mw:WikiLink" title="Japanese calendar">Japanese date</a>: Sixth day of the seventh month of the first year of the Ten'o (天応) era).<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="./July_31#cite_note-1" id="mwGQ" style="counter-reset: mw-Ref 1;"><span class="mw-reflink-text" id="mwGg">[1]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-1"><cite about="#mwt12" class="citation web cs1 cs1-prop-foreign-lang-source" id="CITEREFKoyama">Koyama, Masato. <a class="external text" href="https://sakuya.vulcania.jp/koyama/public_html/Fuji/fujid/781.html" id="mwBgw" rel="mw:ExtLink nofollow">"天応元年（781）噴火"</a>. <i id="mwBg0">Database of eruptions and other activities of Fuji Volcano, Japan, based on historical records since AD781</i> (in Japanese). <a href="./Shizuoka_University" id="mwBg4" rel="mw:WikiLink" title="Shizuoka University">Shizuoka University</a><span class="reference-accessdate" id="mwBg8">. Retrieved <span class="nowrap" id="mwBhA">2021-07-29</span></span>.</cite><span about="#mwt12" class="Z3988" id="mwBhE" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=unknown&amp;rft.jtitle=Database+of+eruptions+and+other+activities+of+Fuji+Volcano%2C+Japan%2C+based+on+historical+records+since+AD781&amp;rft.atitle=%E5%A4%A9%E5%BF%9C%E5%85%83%E5%B9%B4%EF%BC%88781%EF%BC%89%E5%99%B4%E7%81%AB&amp;rft.aulast=Koyama&amp;rft.aufirst=Masato&amp;rft_id=https%3A%2F%2Fsakuya.vulcania.jp%2Fkoyama%2Fpublic_html%2FFuji%2Ffujid%2F781.html&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AJuly+31"></span></span>