The Spanish Arabian, also known as the Classical Spanish Arabian when tracing entirely to pre-1970 Spanish Stud Book bloodlines, represents a distinct type within the purebred Arabian breed developed under Spanish military oversight for over two centuries. These horses are registered as purebred Arabians with the Arabian Horse Association in the United States and with the Spanish Stud Book maintained by Spain's military breeding authority.
The term Classical Spanish Arabian carries particular significance, designating horses whose pedigrees trace in all four lines to horses registered with the Spanish Stud Book prior to 1970. Considerable outcrossing occurred in Spain during the 1970s and 1980s when horses from other Arabian breeding programs were introduced. Breeders valuing the pre-1970 bloodlines distinguish Classical Spanish from Spanish-Related Arabians that include later introductions.
The Spanish Stud Book, established by Queen Isabel II in 1847, holds the distinction of being the oldest established registry of Arabian horses in existence. The Registro Matricula records purebred Arabian horses at age four, with earlier foal registration managed through the military breeding commission. The original registry documents, called the Golden Books, remain preserved in Madrid's archives and include handwritten pedigrees in Arabic from the earliest desert imports.
Spanish Arabian Horse Breeders International and allied organizations promote Classical Spanish Arabian bloodlines and their related crosses. These groups work to preserve the concentrated gene pool that resulted from centuries of controlled breeding while sharing information about Spanish bloodlines with breeders worldwide. Despite representing less than one-tenth of one percent of Arabian horses in the United States, Spanish and Spanish-Related Arabians consistently achieve disproportionate competitive success.

