hilaria
...that the Roman festival of hilaria, which allowed anyone to masquerade as any rank, was used in a plot to assassinate Emperor Commodus, by conspirators planning to disguise themselves as members of the Praetorian Guard?
...that the <a class="mw-redirect" href="./Ancient_Roman" id="mwAQY" rel="mw:WikiLink" title="Ancient Roman">Roman</a> festival of <b id="mwAQc"><a href="./Hilaria" id="mwAQg" rel="mw:WikiLink" title="Hilaria">hilaria</a></b>, which allowed anyone to <a class="mw-disambig" href="./Masquerade" id="mwAQk" rel="mw:WikiLink" title="Masquerade">masquerade</a> as any rank, was used in a plot to assassinate <a class="mw-redirect" href="./Roman_Emperor" id="mwAQo" rel="mw:WikiLink" title="Roman Emperor">Emperor</a> <a href="./Commodus" id="mwAQs" rel="mw:WikiLink" title="Commodus">Commodus</a>, by conspirators planning to disguise themselves as members of the <a href="./Praetorian_Guard" id="mwAQw" rel="mw:WikiLink" title="Praetorian Guard">Praetorian Guard</a>?