 Another son, Prince Bio won the 1944 Prix Noailles and the Poule d'Essai des Poulains, among others.However, most important for horse racing in the United States, in 1939 Prince Rose had been mated with the mare Cosquilla who, because of the onset of World War II, was shipped to safety in Ireland.There, Cosquilla foaled Princequillo who would eventually be sent to race in the U.S. and who would become a very influential stallion.