[3] Roman Hackle's dam Wanoya was a great-granddaughter of the Belgian-bred broodmare Muirninn, whose other descendants included leading National Hunt stallion My Prince and the Belmont Stakes winner Amberoid.
[5] The outbreak of the Second World War led many leading owners to withdraw their horses from racing, but Dorothy Paget persisted, reportedly claiming that the sport was good for morale.
[2] Roman Hackle showed good form in the early part of the year and was strongly-fancied for the fifteenth running of the Cheltenham Gold Cup which was scheduled for 14 March 1940.
[2] Roman Hackle however, won easily under top weight at Windsor Racecourse and started even money favourite for the rescheduled Gold Cup on 20 March.
He recorded his last important success in 1945 when he won by a head at Leopardstown Racecourse although on that occasion he was receiving more than forty pounds in weight from the runner-up Prince Regent.