Crucifix
... that Crucifix was an undefeated British-bred Thoroughbred racemare, as well as being the dam of three sires?
... that <b id="mwB7E"><a href="./Crucifix_(horse)" id="mwB7I" rel="mw:WikiLink" title="Crucifix (horse)">Crucifix</a></b> was an undefeated <a href="./Great_Britain" id="mwB7M" rel="mw:WikiLink" title="Great Britain">British</a>-bred <a href="./Thoroughbred" id="mwB7Q" rel="mw:WikiLink" title="Thoroughbred">Thoroughbred</a> racemare, as well as being the dam of three sires?