✝

Ecumenical Councils

How the Church Defended the Faith Through History

What Are Ecumenical Councils?

Ecumenical Councils are solemn gatherings of bishops from throughout the Church, united with the Pope, to address major questions of doctrine, discipline, and Church life.

The Catholic Church recognizes 21 Ecumenical Councils. These councils helped define doctrine, condemn errors, reform discipline, and guide the Church through major historical challenges.

Nicaea I

Year: AD 325

The First Council of Nicaea defended the true divinity of Jesus Christ against Arianism.

It taught that the Son is truly God and consubstantial with the Father.

This council gave the Church the foundation of the Nicene Creed.

Constantinople I

Year: AD 381

The First Council of Constantinople defended the divinity of the Holy Ghost.

It completed the Creed’s teaching on the Holy Ghost and clarified the Church’s faith in the Most Holy Trinity.

Ephesus

Year: AD 431

The Council of Ephesus defended the unity of Jesus Christ as one Divine Person.

It declared that Mary is rightly called Mother of God, because the child she bore is Jesus Christ, true God and true man.

Chalcedon

Year: AD 451

The Council of Chalcedon taught that Jesus Christ is one Person in two natures: divine and human.

He is fully God and fully man, without confusion, change, division, or separation.

Trent

Years: AD 1545–1563

The Council of Trent responded to the Protestant Reformation and clarified Catholic teaching.

It addressed Scripture and Tradition, justification, the Sacraments, the Mass, and reform of Church discipline.

Vatican I

Years: AD 1869–1870

The First Vatican Council clarified Catholic teaching on the Church, papal authority, and papal infallibility.

It taught that the Pope is preserved from error when he speaks ex cathedra on faith or morals to be held by the whole Church.

Vatican II

Years: AD 1962–1965

The Second Vatican Council was the most recent Ecumenical Council.

It addressed the Church’s mission in the modern world, the liturgy, divine revelation, the role of the laity, ecumenism, and evangelization.

Major Documents

  • Lumen Gentium
  • Sacrosanctum Concilium
  • Dei Verbum
  • Gaudium et Spes

Why These Councils Matter

These councils shaped how Catholics understand the Trinity, Jesus Christ, Mary, the Sacraments, the Church, the Pope, and the Church’s mission.

They show how the Holy Ghost guides the Church in preserving and explaining the faith handed down from the Apostles.

Key Truths About Ecumenical Councils

  • The Catholic Church recognizes 21 Ecumenical Councils.
  • Nicaea I defended the divinity of Christ.
  • Constantinople I defended the divinity of the Holy Ghost.
  • Ephesus defended Mary’s title Mother of God.
  • Chalcedon clarified Christ’s two natures.
  • Trent responded to the Protestant Reformation.
  • Vatican I clarified papal infallibility.
  • Vatican II addressed the Church’s mission in the modern world.

Explore Church History

Continue Learning

Next, explore the Council of Nicaea I and why it matters for understanding Jesus Christ.