Roman emperor <a href="https://en.wikipedia.org/wiki/Severus_Alexander" id="mwFg" rel="mw:WikiLink" title="Severus Alexander">Severus Alexander</a> is murdered, marking the start of the <a href="https://en.wikipedia.org/wiki/Crisis_of_the_Third_Century" id="mwFw" rel="mw:WikiLink" title="Crisis of the Third Century">Crisis of the Third Century</a>.<sup about="#mwt15" class="mw-ref reference" data-mw='{"name":"ref","attrs":{"name":"Monumenta"},"body":{"id":"mw-reference-text-cite_note-Monumenta-1"}}' id="cite_ref-Monumenta_1-0" rel="dc:references" typeof="mw:Extension/ref"><a href="./March_22#cite_note-Monumenta-1" id="mwGA" style="counter-reset: mw-Ref 1;"><span class="mw-reflink-text" id="mwGQ">[1]</span></a></sup>