The trainer is Aidan O'Brien at Ballydoyle in Cashel, Co Tipperary — one of the most famous yards in the world, and right now one of the most productive anywhere. With 144 winners already sent out this season alone, the operation runs at a scale and consistency that most trainers could only dream of. When a horse like Stpaul'scathedral walks out of that yard for the first time, there is at least one thing you can say with confidence: it has been prepared by the best in the business. Whether the horse lives up to its name — and that is a name that sets the bar somewhere near the ceiling — is the question today's race will begin to answer.