<a href="https://en.wikipedia.org/wiki/Old_Style_and_New_Style_dates" id="mwdQ" rel="mw:WikiLink" title="Old Style and New Style dates">Old Style date</a> of the <a href="https://en.wikipedia.org/wiki/October_Revolution" id="mwdg" rel="mw:WikiLink" title="October Revolution">October Revolution</a> in Russia.<!--worth keeping regardless of general rule on OS/NS because it's commonly called the "October revolution"-->