 Henri Tambareau purchased the Thoroughbred mare, Rancune, in 1943 for use as a broodmare.She had won several times on the racetrack, and came from good lines, including that of the famous jumping sire Bay Ronald.Rantzau's sire, Foxlight, was one of the best sons of the French stallion Haras du Pin, and also had the blood of Bay Ronald in his pedigree.