Ali ibn Abbas al-Magusi

'Ali ibn al-'Abbas al-Majusi (died 982–994), also known as Masoudi, or Latinized as Haly Abbas, was a Persianphysician and psychologist most famous for the Kitab al-Maliki or Complete Book of the Medical Art, his textbook on medicine and psychology.

He was born in Ahvaz, southwestern Persia, and studied under Shaikh Abu Maher Musa ibn Sayyār. He was considered one of the three greatest physicians of the Eastern Caliphate of his time, and became physician to Emir 'Adud al-Daula Fana Khusraw of the Buwayhid dynasty, who ruled from 949 CE to 983 CE. The Emir was a great patron of medicine, and founded a hospital at Shiraz in Persia, and in 981 the Al-Adudi Hospital in Baghdad, where al-Majusi worked. His ancestors were Zoroastrian (whence the nisba "al-Majusi"), but he himself was a Muslim. The name of his father was Abbas, and according to Iranica, is not the kind of name typically taken by a neophyte, a fact which suggests that conversion to Islam took place in the generation of his grandparents, if not earlier. He himself seems to have been lacking in Muslim zeal, since no mention is made of the prophet Moḥammad in his introductory remarks, while his argument for the excellence of medicine is based entirely on pragmatic reasoning without recourse to the Koran or the Sunna. Moreover, by calling himself "Ali b. Abbas Majusi", the author intentionally calls attention to his Zoroastrian background.

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