Constantine Doukas
... that the Byzantine general Constantine Doukas was proclaimed emperor in the Hippodrome of Constantinople, but was killed on the same day by supporters of the legitimate emperor, Constantine VII?
... that the <a class="mw-redirect" href="./Byzantine" id="mwENs" rel="mw:WikiLink" title="Byzantine">Byzantine</a> general <b id="mwENw"><a href="./Constantine_Doukas_(usurper)" id="mwEN0" rel="mw:WikiLink" title="Constantine Doukas (usurper)">Constantine Doukas</a></b> was proclaimed emperor in the <a href="./Hippodrome_of_Constantinople" id="mwEN4" rel="mw:WikiLink" title="Hippodrome of Constantinople">Hippodrome of Constantinople</a>, but was killed on the same day by supporters of the legitimate emperor, <a href="./Constantine_VII" id="mwEN8" rel="mw:WikiLink" title="Constantine VII">Constantine VII</a>?