 Lady Wentworth noted that Count Potocki registered Ibrahim as a "Kehilan Ajuz", thus acknowledging his purebred ancestry.Second, the Poles also crossed Arabian stallions on Thoroughbred and other non-Arabian mares, leading some researchers to question the accuracy of the stud books.Further confusion emerged because some European breeders commonly referred to horses by the location they were foaled, rather than by pedigree, and hence the occasional Potocki quote describing the horses at his stud as not "desert-bred" which may have referred to being foaled in Poland.