Syriac · Letters · 7th century CE (before 659)
Ishoʿyahb III of Adiabene · syriac
Work dossier · summary and historical context
Letter 43 of Ishoʿyahb III, patriarch of the Church of the East (649–659), addresses the high-ranking convert Mar Yazdannan on orthodox Christology amid post-Chalcedonian dyophysite controversies. The letter defends the two-nature doctrine of Christ, invokes apostolic and patristic authority, and reflects the patriarch’s efforts to secure lay patronage and ecclesiastical unity. It survives in a single 19th-century Syriac manuscript and was later cited in East Syriac canonical collections as a witness to normative faith.
The letter illustrates how the Church of the East articulated its dyophysite Christology in dialogue with a lay convert from Zoroastrianism, blending theological argument with pastoral care. It also documents the role of monastic networks and lay patrons in shaping ecclesiastical policy under early Islamic rule.
Composed between 649 and 659, during Ishoʿyahb III’s patriarchate of the Church of the East, based in Seleucia-Ctesiphon (Sasanian and early Islamic Mesopotamia). The letter was sent to Mar Yazdannan, a Zoroastrian convert and influential lay patron, likely in the region of Adiabene. The work belongs to the genre of patriarchal epistles, a key medium for doctrinal instruction and ecclesiastical governance. It engages with ongoing Christological debates following the Council of Chalcedon (451), particularly the dyophysite position affirmed by the Church of the East. The letter’s transmission is limited to a single manuscript tradition, edited in the 19th century, with lacunae and uncertain readings. It was later incorporated into East Syriac canon law collections, indicating its normative authority.
Apparatus · what the pipeline recorded
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