[ame] http://en.wikipedia.org/wiki/Racism [/ame]

Richard E. Nisbett has said that the question of racial superiority may go back at least a thousand years, to the time when the Umayyad Caliphate invaded Hispania, occupying most of the Iberian Peninsula for six centuries, where they founded the advanced civilization of Al-Andalus (711–1492). Al-Andalus coincided with La Convivencia, an era of religious tolerance, and with the Golden age of Jewish culture in Iberia (912, the rule of Abd-ar-Rahman III – 1066, Granada massacre).[76] It was followed by a violent Reconquista under the Reyes Catolicos (Catholic Monarchs), Ferdinand V and Isabella I. The Catholic Spaniards then formulated the Cleanliness of blood doctrine. It was during this time in history that the Western concept of aristocratic "blue blood" emerged in a highly racialized and implicitly white supremacist context, as author Robert Lacey explains:

It was the Spaniards who gave the world the notion that an aristocrat's blood is not red but blue. The Spanish nobility started taking shape around the ninth century in classic military fashion, occupying land as warriors on horseback. They were to continue the process for more than five hundred years, clawing back sections of the peninsula from its Moorish occupiers, and a nobleman demonstrated his pedigree by holding up his sword arm to display the filigree of blue-blooded veins beneath his pale skin—proof that his birth had not been contaminated by the dark-skinned enemy. Sangre azul, blue blood, was thus a euphemism for being a white man—Spain's own particular reminder that the refined footsteps of the aristocracy through history carry the rather less refined spoor of racism.