In his Introduction to Galen’s “On the Natural Faculties”, Arthur John Brock, the translator noted that,
“Greek medicine spread, with general Greek culture, throughout Syria, and from thence was … eventually spread to the [Muslim] world. Several of the Prophet’s [peace be upon him] successors (such as the Caliphs Harun-al-Rashid and Abdul-Rahman III) were great patrons of Greek learning, and especially of medicine. The Arabian scholars imbibed Aristotle and Galen with avidity.”
“Avicenna (Ibn Sina), (10th to 11th century) is the foremost name in Arabian medicine: his “Book of the Canon in Medicine,” when translated into Latin, even overshadowed the authority of Galen himself for some four centuries. Of this work [it was said]: “Avicenna, according to his lights, imparted to contemporary medical science the appearance of almost mathematical accuracy…””
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"Clorion"/Scan by NLM [Public domain]