What makes a council ecumenical?
A church council is an assembly that deliberates on matters of faith and ecclesial life. In Orthodox understanding, the authority of the ecumenical councils rests on their faithful expression of the apostolic tradition as received by the Church. The familiar list of seven does not mean that the Church held only seven councils: local councils also played an enduring role. The list identifies these particular assemblies and their reception in the Eastern Orthodox tradition. [1]
A council can leave several kinds of documents. A creed or doctrinal definition sets out teaching; a canon regulates an aspect of church life; letters and records of sessions preserve the argument surrounding the decision. A reader looking for what a council affirmed should therefore locate its adopted text, rather than assume that every speech reproduced among its proceedings expresses the final judgment.
The seven ecumenical councils in order
| No. | Council | Date | Central question |
|---|---|---|---|
| I | Nicaea I | 325 | The Son’s full divinity and relation to the Father [2] |
| II | Constantinople I | 381 | Nicene faith and the divinity of the Holy Spirit [3] |
| III | Ephesus | 431 | The unity of Christ and Mary as Theotokos [4] |
| IV | Chalcedon | 451 | One Christ, fully divine and fully human [5] |
| V | Constantinople II | 553 | The Three Chapters and the interpretation of Christ’s unity [6] |
| VI | Constantinople III | 680–681 | Christ’s divine and human wills and actions [7] |
| VII | Nicaea II | 787 | The place and veneration of sacred images [8] |
This table supplies a route into the documents, not an exhaustive account of each assembly. The later councils repeatedly refer back to earlier decisions. Keep the dates beside you while reading: a sentence defending an earlier council may belong to a dispute several generations after that council met.
Nicaea and Constantinople: the language of the Creed
The creed of Nicaea in 325 affirms that the Son is begotten rather than made and uses homoousios, commonly translated “of one essence” or “consubstantial,” for his relation to the Father. It rejects the claim that the Son once did not exist or is a creature. The term matters because the text distinguishes the Son’s divine identity from the existence of things made through him. [2]
Constantinople in 381 reaffirmed the Nicene faith and confessed the divinity of the Holy Spirit. The creed associated with the first two councils is recited in Orthodox baptism and the Divine Liturgy. Its familiar liturgical use can make the earlier controversies seem remote; reading its clauses slowly restores the questions they answer about Father, Son, and Holy Spirit. [3]
For a useful first exercise, compare the creed of 325 with the creed you encounter in worship. Notice the shorter treatment of the Spirit in the earlier text. Then read the explanation of Constantinople I. This is more informative than assuming that the wording recited today appeared in its entirety at the first council. [2] [3]
Ephesus and Chalcedon: who is Jesus Christ?
At Ephesus in 431, the dispute over Mary’s title Theotokos, Mother of God, concerned the identity of her Son. Cyril of Alexandria argued against separating the divine Word from the human life of Jesus. Calling Mary Theotokos identifies the one born from her according to the flesh as the divine Word; it does not say that the divine nature began with Mary. The title belongs within the argument about the Incarnation. [4] [9]
Cyril of Alexandria should not be confused with Cyril of Jerusalem, whose catechetical lectures are available in this store. Keeping the place-name attached to each author prevents a common reading mistake: a reference to Cyril in the Ephesus documents is not automatically a reference to the Jerusalem catechist.
Chalcedon in 451 confessed one and the same Christ as complete in divinity and humanity, with a human body and rational soul. Its definition maintains two natures without mixing or changing them, and without splitting Christ into two persons. These paired safeguards belong together. The divine and human are neither blended into a third thing nor assigned to two separate Christs. [5]
The contrast between nature and person is central here. In this definition, “two natures” preserves what is divine and what is human; “one person” identifies the single Christ of whom both are confessed. Read the terms within the whole definition before importing their everyday meanings. The council is not describing two alternating personalities. [5]
Constantinople II and III: unity, will, and action
The council of 553 addressed the dispute known as the Three Chapters: Theodore of Mopsuestia and his writings, specified writings of Theodoret, and a letter attributed to Ibas. Its sentence condemned them while defending the earlier councils. This makes the fifth council especially difficult to understand from a slogan: its concern includes how earlier authors and the authority of Chalcedon were being interpreted. [6]
Its chapters reject treating Christ’s union as a mere association of honor or authority. They also reject using the language of unity to mix divinity and humanity into one composite nature. The council seeks to affirm the one incarnate Word while preserving the reality of the divine and human. Read its statements alongside Chalcedon rather than treating them as an unrelated set of propositions. [6]
Constantinople III in 680–681 affirmed two natural wills and two natural operations in the one Christ: divine and human. It explicitly denies that the wills are contrary to each other. The point is that Christ’s humanity includes human willing and action; it is not an inert instrument substituted for a complete human life. The decision develops the implications of confessing him fully human. [7]
For readers moving from a history into theology, this is where the distinction between a chronological account and a doctrinal explanation becomes useful. A history shows who argued and when; a systematic treatment can spend longer explaining how the terms relate. Both help, but they answer different questions.
Nicaea II: why images became a doctrinal question
The council of 787 affirmed sacred images and distinguished their honorable veneration from the worship belonging to God alone. Its decree relates an image’s honor to the person represented and connects pictorial representation with the reality of the Incarnation. The council was therefore addressing how the Church confesses and honors Christ and the saints, not simply choosing a preferred decorative style. [8]
A useful way to read the decree is to ask three questions: which subjects does it permit, how does it describe reverence, and where does that reverence terminate? Its examples include images in churches and homes, as well as sacred objects. This concrete vocabulary gives the decision a setting in worship and devotion. [8]
How to read the sources fairly
Begin with a council’s adopted creed or definition. Next read the document it directly discusses, and only then turn to a wider history of the dispute. This sequence makes it easier to distinguish an opponent’s claim, the council’s response, and a later editor’s explanatory note.
The surviving documents often use severe polemical language. Quoting an accusation does not by itself establish a fair account of everything an opponent believed. This guide explains the councils as received in Eastern Orthodoxy; a comparison with another Christian tradition requires that tradition’s own statements as well. Historical names and condemnations should not be used as shortcuts for describing present-day believers.
Keep translation in view, too. “Essence,” “substance,” “nature,” “person,” and “subsistence” can look interchangeable in ordinary English, yet their relationships are precisely what many of these texts are debating. A small glossary made from the passages you are reading will usually be more useful than memorizing a detached list of definitions.
Which book should you begin with?
For the historical sequence: Philaret Vafeidis
History of the Orthodox Church: The Ecumenical Councils, the Church from Constantine to AD 700 provides the historical route in this selection. Its stated date range includes the period of the first six councils, ending before Nicaea II in 787. Choose this volume for the earlier sequence; use the seventh council’s primary decree for that later decision. The volume’s boundary is worth checking before buying it for a particular century. [10]
For an organized explanation of doctrine: John of Damascus
An Exact Exposition of the Orthodox Faith is arranged by theological subjects. Book III includes chapters on Christ’s two natures, wills, and operations; Book IV, chapter 16 treats images. Choose it to work through the doctrine after establishing the chronology. Our edition uses S. D. F. Salmond’s historical translation. The John of Damascus biography introduces the author and his setting. [11]
For faith explained to those preparing for baptism: Cyril of Jerusalem
The Ancient Catechism of Jerusalem approaches doctrine through instruction. Lectures 10–12 address Jesus Christ, the Only-Begotten Son, and the Incarnation; lectures 16–17 concern the Holy Spirit. Choose it for the catechetical voice and scriptural exposition, rather than for a history of council proceedings. These chapter connections are a way into the themes, not a claim that the book comments on all seven councils. [12]
The theology reading guide offers a wider route through the catalog. To explore the people behind the books, continue to Philaret Vafeidis and the saints and authors directory.