Azor
... that the racehorse Azor won the 1817 Derby Stakes after being entered in the race only to act as a pacemaker for a more highly regarded stable companion?
... that the racehorse <b id="mwCoY"><a href="./Azor_(horse)" id="mwCoc" rel="mw:WikiLink" title="Azor (horse)">Azor</a></b> won the 1817 <a href="./Epsom_Derby" id="mwCog" rel="mw:WikiLink" title="Epsom Derby">Derby Stakes</a> after being entered in the race only to act as a <a href="./Pacemaker_(running)" id="mwCok" rel="mw:WikiLink" title="Pacemaker (running)">pacemaker</a> for a more highly regarded stable companion?