Yuhanna ibn Masawaih (circa 777–857), (), also written Ibn Masawaih, Masawaiyh, and in Latin Janus Damascenus,V.C. Medvei, The History of Clinical Endocrinology, p. 45. or Mesue, Masuya, Mesue Major, Msuya, and Mesuë the Elder was a Persians
He became director of a hospital in Baghdad, and was personal physician to four Abbasid caliphs. He composed medical treatises on several topics, including ophthalmology, fevers, leprosy, headache, melancholia, dietetics, the testing of physicians, and medical . One of Masawaiyh's treatises concerns aromatics, entitled, On Simple Aromatic Substances.
It was reported that Ibn Masawayh regularly held an assembly where he consulted with patients and discussed subjects with his pupils. Ibn Masawayh attracted considerable audiences, having acquired a reputation for repartee.
He was also the teacher of Hunayn ibn Ishaq. He translated various Greek language medical works into Syriac language, but wrote his own work in Arabic. were supplied to him by Caliph al-Mu'tasim for dissection.
Many anatomical and medical writings are credited to him, notably the Disorder of the Eye ( Daghal al-ʿayn), which is the earliest systematic treatise on ophthalmology extant in Arabic, and The Aphorisms, the Latin translation of which was very popular in the Middle Ages.
He died in Samarra in 857.
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