 Abū Bakr Muḥammad ibn Zakariyyāʾ al-Rāzī made his fame mostly as a doctor. As his name “al-Rāzī” indicates, he hailed from the Persian city of Rayy, near modern-day Tehran. His biographers report that he ran a hospital there, and another in Baghdad. He received patronage from Abū Ṣāliḥ al-Manṣūr (d. 914), the governor of Rayy, to whom al-Rāzī dedicated a substantial medical treatise, The Book for al-Manṣūr. We have a variety of anecdotes about al-Rāzī’s medical practice, some found in his own works and some in his medieval biographers, for instance that al-Rāzī would deal only with patients whose condition stumped his students. We also know, because he tells us himself, that he suffered from eye problems and a hand injury from copious reading, copying, and writing.