 His grandsire was Prince Palatine, a two-time British Horse of the Year and his damsire was Gay Crusader, winner of the 1917 English Triple Crown.The Earl of Durham died in 1929 and his estate sold Prince Rose to Henri Coppez (1869–1946) who brought him to Belgium.At age three, Prince Rose won the Grand Prix de Bruxelles, beat the great French filly Pearl Cap in the then was third to her in the 1931 Prix de l'Arc de Triomphe.