Masawaiyh
Assyrian physician

Yuhanna ibn Masawaih (circa 777–857), (Arabic: يوحنا بن ماسويه), also written Ibn Masawaih, Masawaiyh, and in Latin Janus Damascenus, or Mesue, Masuya, Mesue Major, Msuya, and Mesuë the Elder was an Assyrian or Persian physician, trained by Jabril ibn Bukhtishu, who was a member of the Church of the East, from the Academy of Gondishapur. According to The Canon of Medicine for Avicenna and 'Uyun al-Anba for the medieval Arab historian ibn Abi Usaybi'a, Masawaiyh's father was from Khuzestan and his mother was a Slav.
Life
Born in 777 as the son of a pharmacist and physician from Gundeshapur, he came to Baghdad and studied under Jabril ibn Bukhtishu.
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 aphorisms. 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 medical works into Syriac, but wrote his own work in Arabic.
The public source identifies “Masawaiyh” as assyrian physician. This brief keeps that definition visible, then builds a research path around Masawaiyh, Assyrian and physician.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Masawaiyh”, the useful work is to connect “assyrian physician” to the records capable of establishing context and consequence.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 6, 2026. The linked authority identifier is Q1291511. VIAF identifies the subject as 112670997. The Library of Congress control number is n81033589. 3 of 3 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Masawaiyh”, its source revision and the description used here.
- Expand the search: follow Masawaiyh primary sources, Masawaiyh archive and Masawaiyh research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Masawaiyh”?
- Which cited source is closest to the event, object or claim?
- Which institution is responsible for the underlying evidence?
Search terms from this dossier
This entry incorporates text from “Masawaiyh” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.