Thirteenth-century physician, priest, and author. The most significant, modern source of information on him is ’s (1947, Vol. 2, pp. 344-48), from which the following data come.

His writings, largely in defence of Christianity, were composed in the period between 1204 and about 1245 at the latest. Among these is al-‘Uqul fi ‘Ilm al’Usul (Theriac of the Understanding in the Science of the Fundamentals), a work he wrote at the instigation of the vizier Taqi al-Din. It was to serve as an “antidote” to Muslim polemicists. The twenty-four chapters of the principal dogmatic section discuss Christian teachings on the and Incarnation; the theology of the religions preceding Christianity, that is, the heathenism of “the philosophers,” , and ; the general resurrection, the reverence of images, , and the . A second part explains and justifies the Christian moral code. In the appended compendium of abstracts, the (d. 1204) and the Muslim philosopher (d. 1209) are cited among non-Christian writers. Al-Mu‘taman Abu Ishaq ibn al-‘Assal took an excerpt from the Tiryaq for his Majmu‘ Usul al-Din (Compendium of the Principles of Religion) and introduced it with these words: “There is a treatise by the esteemed priest, the wise, respected, learned, and energetic administrator [al-‘Alim wa-al-‘Amil] , the physician who assisted in the composition of this book—God keep him long among the living and preserve also that which results from his actions and teachings—from which I have taken the following.”

The Summa of the Beliefs and a treatise are found in Vatican manuscripts adjoined to the Tiryaq where they are attributed to Abu al-Barakat . They are, however, from the pen of . The Summa [or the Most Important] of the beliefs of the Christian Faith and Refutation of the Islamic and Jewish Peoples from Their Own Principles and Fundamentals was also written at the request of Muslim and Jewish friends. In it Ibn al-Tayyib explains the doctrine of the Trinity (in the preface) and demonstrates the of Christ (in three chapters). The quotations from (, Irenaeus, , ) are taken from the anthology, Confessions of the Fathers. In a treatise Ibn al-Tayyib refutes fatalism and the erroneous doctrine of the temporality and the creation of the divine nature of Christ. He relies even more heavily on Confessions of the Fathers for quotations than he did in the Summa.

In the (Compendium) of Sbath are listed 131 sermons by Ibn al-Tayyib titled , and Abu al-Barakat ibn Kabar cites “Sermons” among the written works of Ibn al-Tayyib. It is possible that the sermons mentioned by Ibn Kabar are to be identified with those listed in the Fihris. It is also possible that the sermons discussed in Sbath are to be found in the collection of eighty-seven sermons based on homilies on the Gospels by that Abu al-Khayr arranged and assigned to specific days of the Coptic calendar (see Graf, Vol. 1, pp. 340-41).


  • Al-Mu’taman Abu Ishaq Ibrahim ibn al-‘Assal. Majmu‘ Usul al- Din. Cairo, 1908.
  • Sbath, P. (Catalogue de manuscrits arabes). 3 vols in 2. Cairo, 1938-1940.

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