John Bagot Glubb quotes:

Khalif (Caliph) Al-Ma'mun's period of rule (813 - 833 C.E.) may be considered the 'golden age' of science and learning. He had always been devoted to books and to learned pursuits. His brilliant mind was interested in every form of intellectual activity. Not only poetry but also philosophy, theology, astronomy, medicine and law all occupied his time.

For five hundred years, Baghdad had been a city of palaces, mosques, libraries and colleges. Its universities and hospitals were the most up-to-date in the world. Nothing now remained but heaps of rubble and a stench of decaying human flesh.

By Mamun's time medical schools were extremely active in Baghdad. The first free public hospital was opened in Baghdad during the Caliphate of Haroon-ar-Rashid. As the system developed, physicians and surgeons were appointed who gave lectures to medical students and issued diplomas to those who were considered qualified to practice. The first hospital in Egypt was opened in 872 AD and thereafter public hospitals sprang up all over the empire from Spain and the Maghrib to Persia.