I thought that might have been a trick question. Oh well.
Just satisfying my curiosity, I’ve reminded myself of the top class horses PP trained in the early/mid 1960s. Noblesse (Oaks winner by 10l) Ragusa (Irish Derby, King George VI & Queen Elizabeth Stakes, St Leger & Eclipse) Pourparler (1,000 Guineas) and Meadow Court (Irish Derby & King George VI & Queen Elizabeth Stakes). All within the space of 3 seasons.