Isaac was bishop of
Seleucia-Ctesiphon, grand metropolitan and primate of the
Church of the East
The Church of the East ( syc, ܥܕܬܐ ܕܡܕܢܚܐ, ''ʿĒḏtā d-Maḏenḥā'') or the East Syriac Church, also called the Church of Seleucia-Ctesiphon, the Persian Church, the Assyrian Church, the Babylonian Church or the Nestorian C ...
from 399 to 410. He is included in the traditional
list of patriarchs of the Church of the East.
Sources
Brief accounts of Isaac's reign are given in the ''Ecclesiastical Chronicle'' of the Jacobite writer
Bar Hebraeus
Gregory Bar Hebraeus ( syc, ܓܪܝܓܘܪܝܘܣ ܒܪ ܥܒܪܝܐ, b. 1226 - d. 30 July 1286), known by his Syriac ancestral surname as Bar Ebraya or Bar Ebroyo, and also by a Latinized name Abulpharagius, was an Aramean Maphrian (regional primat ...
(''floruit'' 1280) and in the