LEXINGTON, Ky. - Just as a Julius Caesar parlayed small victories into great victories and grew to rule the world, racehorses also can parlay their talents into unexpected dominion. Breeders' Cup Juvenile favorite Roman Ruler stands at the edge of a great divide. If he crosses the Rubicon and, like Caesar before him, meets with great success, Roman Ruler will become the winter book favorite for the Kentucky Derby and the most talked-about horse for the races leading up to the Triple Crown next season.