The Ecumenical Councils

Three marks: it must be convened with the intent of binding the universal Church, the bishops of the universal Church must be summoned, and its decrees must receive the confirmation of the Bishop of Rome. A council that lacks any of these is regional, particular, or — in the Catholic view — simply not ecumenical at all.

Trent ran for eighteen years across three principal sessions and produced the most thorough doctrinal and disciplinary reform program any council had ever attempted. It defined Catholic teaching on justification, the seven sacraments, Scripture and Tradition, original sin, the Eucharist as true sacrifice, the priesthood, and a host of related questions. Its Roman Missal, promulgated by Pope St. Pius V in 1570, became the standard form of the Latin liturgy for four hundred years.

Catholics affirm yes. Eastern Orthodox Christians affirm only the first seven. The disagreement turns on whether communion with the See of Peter is essential to the universality of a council — the Catholic position holds that it is, and so the medieval and modern councils, all confirmed by the Pope, remain ecumenical for Catholics even though the East no longer participates.

A 449 gathering at Ephesus that produced binding-looking decrees but was held under coercion, lacked free participation, and was repudiated by Pope Leo I, whose Tome was suppressed at the assembly. Pope Leo coined the term latrocinium — robbery — to describe it. Catholics do not count it among the ecumenical councils, and the true Council of Chalcedon two years later overturned its rulings.

The Council of Jerusalem (c. AD 49–50), recorded in Acts 15, is revered by the Catholic Church as the divinely-inspired template for every later council — but it is not numbered among the twenty-one ecumenical councils because it belongs to a different category entirely. The twenty-one are councils of the Apostles’ successors (the bishops) gathered under the authority of the successor of St. Peter. Jerusalem was a council of the Apostles themselves, with St. Peter, St. James of Jerusalem, St. Paul, and St. Barnabas in person. Apostolic authority is direct and immediate; episcopal authority is mediated and successional.

Yet the pattern is unmistakably the same: a question divides the Church (must Gentile converts be circumcised?), the assembly gathers, debate is heard, Peter speaks decisively (Acts 15:7–11), James formulates the practical decree, the body endorses it, and the decision is promulgated with the formula “It seemed good to the Holy Spirit and to us” (Acts 15:28) — the very logic of conciliar binding force that every later council inherits. Jerusalem is not the first ecumenical council; it is the constitutional ground of ecumenical councils as such — the New Testament’s own witness that the Church governs herself synodally, with Peter at the center.

Yes — substantively yes, even when the emperor handled the logistics. For the first eight ecumenical councils, Roman or Byzantine emperors physically convened the bishops, paid for travel, and provided imperial enforcement. But papal authority was always doctrinally central, and no council bound the universal Church without Roman approbation.

A few of the clearest moments: at Nicaea I (325), Pope St. Sylvester sent legates Vito and Vincentius, who signed the council’s acts ahead of the other bishops. Ephesus (431) operated under explicit papal mandate — Pope St. Celestine had already pre-condemned Nestorius and authorized St. Cyril of Alexandria to act in Rome’s name; the legate Philip declared on the council floor that the Petrine office is that “by which the holy fathers in every age have asked questions and judged.” At Chalcedon (451), the Tome of Pope St. Leo the Great was read aloud and the assembled fathers acclaimed it: “Peter has spoken through Leo!” When Leo refused to confirm Chalcedon’s controversial Canon 28 — which the imperial party had pushed through to elevate Constantinople — his refusal stood, and the canon was not received in the West.

The pattern across the imperial era is consistent: emperors gathered the bishops; popes set the doctrinal terms and gave or withheld the seal of universal reception. Councils that lacked papal confirmation — the Robber Council of Ephesus (449), the iconoclast pseudo-council of Hieria (754) — never became ecumenical, no matter how many bishops attended or how strongly the emperor backed them. From Lateran I (1123) onward, the popes convoked the councils directly themselves; but the underlying principle never changed. A council is ecumenical only when it is with Peter and under Peter.

The two communions parted ways from the Catholic Church for very different reasons in very different centuries, so they accept very different numbers of ecumenical councils.

The Oriental Orthodox family (Coptic, Ethiopian, Eritrean, Syriac, Armenian, and Indian Malankara) accepts only the first three: Nicaea I, Constantinople I, and Ephesus. They rejected Chalcedon (451) over its Christological language. Where Chalcedon defined Christ as “in two natures, without confusion or change, without division or separation,” the Oriental tradition preferred St. Cyril’s earlier formula of “one incarnate nature of God the Word.” For centuries Latin and Greek Christians read this as monophysitism (one nature, period); but modern dialogue, especially the joint Christological declarations of the 1980s and 1990s, has clarified that the Oriental Orthodox actually hold miaphysitism — one nature out of two, not one nature instead of two. The substance is closer than the language; the breach was tragically partly verbal.

The Eastern Orthodox (Greek, Russian, Serbian, Romanian, and others) accept seven councils — the same first seven the Catholic Church recognizes — and reject every later council as ecumenical. Their reasoning is ecclesiological rather than Christological: in Eastern Orthodox theology, an ecumenical council must be received by all the apostolic patriarchates in communion with one another. Once the East–West Schism of 1054 broke that communion (from their reading), no subsequent council — Lateran, Lyons, Florence, Trent, Vatican I, Vatican II — could be ecumenical, because Rome was no longer in the conciliar circle. There is also a specific disagreement about which Constantinople IV is ecumenical: the Catholic Church counts the council of 869–870, which deposed Photius, while many Orthodox count instead the council of 879–880, which restored him.

So the divergence is straightforward: the Oriental Orthodox broke off in the fifth century over Christology; the Eastern Orthodox broke off in the eleventh century over communion with Rome. Each group’s council count freezes precisely at the point of separation.

Three stand out, and a fourth is the silent witness.

Nicaea I (325), Canon 6 is the bedrock. Setting the jurisdictions of the great sees, Nicaea declares: “Let the ancient customs prevail… since this is the custom for the Bishop of Rome.” The canon is not granting Rome primacy; it is acknowledging Roman primacy as already so ancient that it serves as the model by which Alexandria’s and Antioch’s regional jurisdictions are measured. By the year 325, Roman primacy is older than the conciliar fathers can date.

Ephesus (431) witnesses primacy in action. Pope St. Celestine had already condemned Nestorius and instructed St. Cyril of Alexandria to depose him “in our name and authority.” The papal legate Philip declared on the council floor that “no one doubts, indeed it has been known to all generations, that the holy and most blessed Peter, prince and head of the Apostles, pillar of the faith and foundation of the Catholic Church, received the keys of the kingdom from our Lord… and lives and exercises judgment to this day and always in his successors.” The bishops did not contest him. The council’s working principle is that Cyril is acting under Rome’s mandate, not the other way around.

Chalcedon (451) is the most dramatic. The Tome of Pope St. Leo the Great was read to the assembled bishops, who responded with the famous acclamation: “This is the faith of the fathers… Peter has spoken through Leo!” The council formally requested papal confirmation of its acts. And when Leo refused to confirm Canon 28 — which had attempted to give Constantinople a primacy of honor second only to Rome on imperial-political grounds — that single canon never took binding effect in the universal Church. The pope’s veto held against the assembled patriarchs.

The silent witness is the Robber Council of Ephesus (449) — never numbered ecumenical for one decisive reason: Pope Leo refused to ratify it. A council attended by hundreds of Eastern bishops, presided over by the Patriarch of Alexandria, backed by the emperor, was nullified by the simple fact that Rome would not receive it. That negative case proves what the positive cases assume: in the first millennium, no council the pope rejected stood, and every council the pope confirmed was received as ecumenical.

Vatican II meets the formal canonical criteria of an ecumenical council — it was summoned by a reigning pope, attended by the bishops of the universal Church, and its acts were promulgated by Pope Paul VI. By that measure it stands as the twenty-first ecumenical council and is counted as such by the Catholic Church.

What is genuinely debated, particularly within Traditional Catholic circles, is what kind of council Vatican II was and what level of assent its teachings command. The council itself, by the explicit declaration of Popes John XXIII and Paul VI, was pastoral rather than dogmatic. It defined no new dogmas, issued no anathemas, and its documents do not carry the same magisterial weight as the dogmatic decrees of Trent or Vatican I.

Three particular questions remain contested: whether documents such as Dignitatis Humanae on religious liberty can be reconciled with prior magisterial teaching (e.g., Quanta Cura, Mirari Vos); what level of religious assent is owed to non-dogmatic, non-binding pastoral statements; and how the council’s reform program in liturgy, ecumenism, and inter-religious dialogue stands in continuity with the entire prior tradition. These are not fringe questions — they have been raised by bishops, theologians, and faithful Catholics in good standing.

Called by Pope St. John XXIII as a “new Pentecost,” Vatican II ran from 1962 to 1965 and produced sixteen major documents on liturgy, the Church, ecumenism, religious liberty, divine revelation, and the Church’s engagement with the modern world. It was a pastoral council — not a dogmatic one — and defined no new dogmas. Its full reception remains one of the most actively debated questions in contemporary Catholic life.

The question of how Vatican II’s reform program in liturgy, ecumenism, and religious liberty stands in continuity with prior councils — particularly Trent and Vatican I — is the central interpretive question of the post-conciliar era. Pope Benedict XVI articulated the answer in his “hermeneutic of continuity”: Vatican II must be read in continuity with the whole of Catholic tradition, not as a rupture from it. How well that reading has been received in practice remains contested.