Jean le Blanc, a founding stallion of the Percheron breed, was foaled in 1823. Both the Andalusian and the Percheron have Spanish and Barb ancestry. He bred Percheron and French Coach Horses. Percheron, Boulonnais and Thoroughbred blood were also added, although they had little impact. The Heavy Draft Breton is derived from an infusion of Ardennes and Percheron blood. In 1918, the British Percheron Horse Society was formed. The process at Seqiris starts with the snake venom being injected into Percheron horses. Since 1934, the group has been known as the Percheron Horse Association of America. Percheron and Filion (1991) thus argued for a "dynamically focused convergence". After , increasing mechanization prompted a decline in the Percheron population. The overall impression of the Percheron is one of power and ruggedness. This system still describes the subdivision of the thalamus (Percheron, 1977, Percheron et al. 1996). The size considered ideal for the Percheron varies between countries. In 1810 he married Adelaide Percheron, a French pianist and former pupil. Later, in the panic of 1893, the Percheron Association went bankrupt and ceased to function.