Bloomsbury
... that after the Thoroughbred racehorse Bloomsbury won the 1839 Derby Stakes, his identity was questioned and bookmakers refused to pay out on "winning" bets?
... that after the Thoroughbred racehorse <b id="mwDNs"><a href="./Bloomsbury_(horse)" id="mwDNw" rel="mw:WikiLink" title="Bloomsbury (horse)">Bloomsbury</a></b> won the 1839 <a href="./Epsom_Derby" id="mwDN0" rel="mw:WikiLink" title="Epsom Derby">Derby Stakes</a>, his identity was questioned and bookmakers refused to pay out on "winning" bets?