The Lusitano, officially known as Puro Sangue Lusitano (PSL) meaning Pure Blood Lusitano, takes its name from Lusitania, the ancient Roman name for the region now known as Portugal. Until 1967, Portuguese and Spanish horses shared the same studbook and were collectively called Andalusians or Iberian horses regardless of their actual birthplace. When the studbooks divided, the Portuguese branch adopted the Lusitano name to distinguish itself from the Spanish Pura Raza Española (PRE).
The Associação Portuguesa de Criadores do Cavalo Puro Sangue Lusitano (APSL) maintains the official registry for the breed, with pedigree records dating back to 1824. The Portuguese studbook recognizes six founding horses—five stallions and one mare—as heads of lineage, representing the main breeding lines: Andrade, Veiga, and Coudelaria Nacional. Each line maintains distinct characteristics while meeting overall breed standards.
The Alter Real represents a distinct strain within the Lusitano breed, bred exclusively at the Alter Real stud farm established by the Portuguese royal family in 1748 to supply horses for the national equestrian academy and royal court. Alter Real horses can only be bay and show subtle conformational differences from other Lusitanos, including a more straight face profile. After near extinction following the 1910 revolution, the strain was saved by Dr. Ruy d'Andrade and is now maintained by the Portuguese Ministry of Agriculture.
In the United States and Canada, the US Lusitano Association (USLA) serves as a sister organization to the APSL, preserving, protecting, and promoting the Lusitano breed in North America. Similar organizations exist in Australia, where the Lusitano Horse Association of Australasia (LHAA) also maintains oversight of Purebred Iberian Horses (Andalusian/Lusitano crosses).
