عبد الرحمن الناصر لدين الله
The historian said al-Andalus wrote that Caliph Abd-ar-Rahman III had collected libraries of books and granted patronage to scholars of medicine and "ancient sciences". Later, "al-Mustansir" (Al-Hakam II) went yet further, building a university and libraries in Córdoba. Córdoba became one of the world's leading centres of medicine and philosophical debate.