 His sire, Prince Rose, stood at the Haras de Cheffreville stud farm in France and was mated to the mare Cosquilla.When World War II broke out, the pregnant mare was shipped to Ireland, where she gave birth to Princequillo.Considering the danger from German bombing and the likelihood there would be no racing for some considerable time, Cosquilla's owners shipped her and her colt to the United States.