Of all the Moslem rulers, the most distinguished for love of learning and general enlightenment was Haroun-al-Raschid, the Charlemagne of the East, contemporary and emulator of the glory of the emperor of the Franks, the hero of a hundred Arabic poems, whose dominion extended from the borders of the Indus to the heart of the Spanish peninsula. He embellished Bagdad, his capital, with schools and hospitals. His son Almamon founded the Academy of Bagdad, which became the most celebrated of the age; likewise spared no pains to draw to his court the most illustrious men of all countries. He enjoined each of his ambassadors to purchase all the writings of the philosophers and physicians that could be found, and these he required to be translated into Arabic; his interpreter, Honain, a Christian, was employed at translating for forty-five{059} years, and received, for each book rendered into Arabic, literally its weight in gold. The eclat which the Moorish caliphs shed upon Spain from the tenth to the thirteenth century is well known. The cities of Cordova, Toledo, Seville, and Murcia possessed public libraries and academies, and students from all parts of Europe flocked to them to be instructed in arts and sciences; the library of Cordova alone embraced more than two hundred and twenty-four thousand volumes. Thus it will be seen that the dominion of mental and temporal affairs passed from the Greeks and Romans to the Saracens. Arabian medicine constitutes one of the most interesting chapters in the history of our art. An offspring from Greek schools, it was for nearly one hundred years the fostermother of that art, and, although it gave rise to no great discovery nor wonderful step in advance during all this period, it nevertheless kept alive all the learning of the past, and clarified rather than made it turbid. In the sixth century the Nestorians (followers of Bishop Nestor), having been driven out of Syria, settled in Persia, Mesopotamia, and Arabia, and there founded schools and other institutions such as they had had at home,--schools in which, beside the ordinary philosophic studies, medicine received a share of attention. Thus it came about that by the seventh century Arabian physicians were everywhere known and in high repute. Naturally the basis for their studies embodied the writings of Hippocrates, Galen, Oribasius, and Paul of Ægina; and the first Arabian works consisted solely of translations from the Greek, first out of their Syriac rendering, and later from the originals. Indeed, so much eminence was finally achieved by Arabian physicians that more than four hundred are known by name as authors. The first author deserving of mention was _Bachtischua_, of Nestorian stock, celebrated in Jondisapur, director of the medical school, and later physician to Caliph El-Mansur, in Bagdad.{060} Of his descendants several became well known in the same field.