Al-Razi (Rhazes)
~854–925 · Persian (Ray, Iran) · Islamic Golden Age
Known for: The greatest clinical physician of the medieval world — wrote 200+ books and was the first to distinguish smallpox from measles
Abu Bakr al-Razi was a physician, philosopher, and alchemist who wrote over 200 works including the 23-volume Comprehensive Book of Medicine. He was the first to differentiate smallpox from measles clinically.
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