Year after year, the thread of his horsemanship snags another big prize in the web of his many different interests. And this spring Gabriel Duignan is back on the GI Kentucky Derby trail—this time as breeder, his Springhouse Farm near Lexington having started Forbidden Kingdom (American Pharoah) along the road that has already taken in two of the big Californian trials, latterly the GII San Felipe S. at Santa Anita last weekend. Before you ask: disappointingly, there's no real story behind the nickname. When he started as a kid at...