Princess Royal Stakes  The Princess Royal Stakes is a Group 3 flat horse race in Great Britain open to fillies and mares aged three years or older. It is run over a distance of 1 mile and 4 furlongs (2,414 metres) on the Rowley Mile at Newmarket in September. The title Princess Royal Stakes was originally given to a Group 3 race of similar conditions and distance run at Ascot Racecourse. This race was retitled the Pride Stakes and transferred to Newmarket in 2008, while Ascot's Harvest Stakes, a Listed race, was renamed as the "new" Princess Royal Stakes. The Pride Stakes subsequently returned to Ascot and became the British Champions Fillies' and Mares' Stakes, while the Princess Royal Stakes was moved to Newmarket. It was upgraded to Group 3 status in 2017.