Defining Christ

The Church of the East and Nascent Islam

By (author) M. Metselaar

Book cover: Defining Christ

Extent: 476 pages

Publisher: Peeters Publishers

Subjects: Islamic & Middle Eastern Studies, Medieval Studies, Religious Studies

Series: Late Antique History and Religion

Series volume number: 19

Language: English

Hardback (Published)

(November 2019)

ISBN: 9789042938052

Price: $132.00

In stock

PDF (Published)

(November 2019)

ISBN: 9789042938069

Price: $132.00

Defining Christ describes the theological developments of the Church of the East in the Persian Empire in the seventh century, when Arab groupings were seizing power. This Church defined and emphasized the difference between the divine and human nature of Christ in such a way that it had already come in strong conflict with other Christian denominations. Now, it also had to deal with new rulers who recognized Christ as a unique human being, but rejected the belief in his divinity. The book investigates to what extent the leaders of this Church adapted their statements concerning Christ to the rapidly changing circumstances and views. Most attention is thereby given to the 106 letters of Isho’yahb III, written between about 625 and 659. These letters shed an interesting light on this period and for a better understanding they are set in the context of wider theological and political developments.


Defining Christ describes the theological developments of the Church of the East in the Persian Empire in the seventh century, when Arab groupings were seizing power. This Church defined and emphasized the difference between the divine and human nature of Christ in such a way that it had already come in strong conflict with other Christian denominations. Now, it also had to deal with new rulers who recognized Christ as a unique human being, but rejected the belief in his divinity. The book investigates to what extent the leaders of this Church adapted their statements concerning Christ to the rapidly changing circumstances and views. Most attention is thereby given to the 106 letters of Isho’yahb III, written between about 625 and 659. These letters shed an interesting light on this period and for a better understanding they are set in the context of wider theological and political developments.

  • By (author) M. Metselaar

". . . an extensive, detailed exposition of the development of the Christological doctrine of the Church of the East in late antiquity. . . . Defining Christ is an admirably thorough examination of East Syrian theology over the course of a critical century. The degree of detail it offers across a range of East Syrian theologians will make it useful even as a reference work, and it should be of great interest to advanced graduate students and scholars of theology and Christian late antiquity." Weitz, Lev, Church History, July 1, 2021 "Defining Christ offers a comprehensive survey of the first seven centuries of Christology of the catholicoi of the Church of the East and contains one of the best collections of Persian Christian terminology as it appears in the East Syriac literature." Bantu, Vince L., International Journal of Systemic Theology, April 2021