A historical and descriptive introduction. Local practice varies; the examples below are not a judgment of a community’s faithfulness.
When and how it began
The Church of the East developed in the Persian world, with a major center at Seleucia-Ctesiphon. Political separation and theological controversies shaped its distinct history. Medieval communities extended into India and China. Apostolic foundation accounts are church traditions, not independently established foundation certificates.
Beliefs and practices
East Syriac liturgy, sacramental life, bishops, and continuity with ancient teachers are central. “Nestorian” is often used historically but can misrepresent the church’s self-understanding.
A typical worship service
The Holy Qurbana is a Eucharistic service with Scripture, prayers, and chant. Syriac and local languages may both be used.
What the worship space looks like
An altar, cross, and defined sanctuary are characteristic; decoration varies by community.
Branches and differences
The Assyrian Church of the East and Ancient Church of the East are distinct bodies. Chaldean Catholics share East Syriac heritage but belong to the Catholic Church. These are not simply branches of Oriental Orthodoxy.
Sources & further reading
Historical overviews support the account of origins. Official church documents describe the community’s own beliefs and practice.
Reviewed September 24, 2026. Broad family descriptions do not settle local policies or every contested point of history.