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 a 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.
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