Waxy
... that when Waxy won the 1793 Derby Stakes, more than half of the competing racehorses were his siblings sired by Pot-8-Os?
... that when <b id="mwAcs"><a href="./Waxy_(horse)" id="mwAcw" rel="mw:WikiLink" title="Waxy (horse)">Waxy</a></b> won the 1793 <a href="./Epsom_Derby" id="mwAc0" rel="mw:WikiLink" title="Epsom Derby">Derby Stakes</a>, more than half of the competing racehorses were his siblings sired by <a href="./Potoooooooo" id="mwAc4" rel="mw:WikiLink" title="Potoooooooo">Pot-8-Os</a>?