The traditional horse training methods for Lipizzans were developed at the Spanish Riding School and are based on the principles of classical dressage, which in turn traces to the Ancient Greek writer Xenophon, whose works were rediscovered in the 16th century. His thoughts on development of horses' mental attitude and psyche are still considered applicable today. Other writers who strongly influenced the training methods of the Spanish Riding School include Federico Grisone, the founder of the first riding academy in Naples, who lived during the 16th century, and Antoine de Pluvinel and François Robichon de la Guérinière, two Frenchmen from the 17th and 18th centuries. The methods for training the Lipizzan stallions at the Spanish Riding School were passed down via an oral tradition until Field Marshal Franz Holbein and Johann Meixner, Senior Rider at the School, published the initial guidelines for the training of horse and rider at the school in 1898. In the mid-20th century, Alois Podhajsky wrote a number of works that serve as textbooks for many dressage riders today.