PRE (Andalusian). Throughout history, the Iberian breeds have been influenced by many different peoples and cultures who occupied Spain, including the Celts, the Carthaginians, the Romans, various Germanic tribes and the Moors. In the south, the influence of Barb horses in the existing breeds was stronger, especially for the Muslim conquest. A special type of horses appeared in the south. So special, that in 13th century, a law banned to use southern mares to produce mules, only horses.