Did the Catholic Church agree with Nestorians?

By CopticBot.ai (Coptic Space Inc.) · Last reviewed 2026-10-10

The relationship between the Roman Catholic Church and those following the teachings of Nestorius is complex, as it involves both an ancient condemnation and a modern effort to resolve linguistic misunderstandings.

1. The Ancient Condemnation

Historically, the Roman Catholic Church—alongside the Coptic Orthodox Church—condemned Nestorius and his teachings at the Council of Ephesus in 431 AD.

The Coptic Church, led by St. Cyril of Alexandria, defended the term Theotokos—Mother of God, while Nestorius preferred Christotokos* (Mother of Christ). Nestorius’s heresy involved a division in the person of Christ, suggesting two separate persons or two distinct "prosopa"—one divine and one human—joined only by a moral or accidental union (a "dwelling") rather than a true hypostatic union.

The Western Church (Rome) supported St. Cyril’s Twelve Anathemas against Nestorius. Therefore, for most of history, the Roman Catholic Church viewed Nestorius as a heretic and an "enemy of God."

2. The Tome of Leo and Chalcedon (451 AD)

While the Roman Catholic Church condemned Nestorius, a major point of contention for Coptic Orthodox Christians is the Tome of Leo (a letter by Pope Leo I of Rome). At the Council of Chalcedon, this document was accepted by the Catholics.

From the Coptic perspective, the Tome of Leo was seen as leaning toward Nestorianism because it spoke of two natures acting separately ("each form does what is proper to it"). This confusion caused the great schism. While the Catholics claim they were maintaining the distinction of natures without dividing the person, the Coptic Church correctly identified this language as a departure from the unified "One Nature" formula of St. Cyril.

3. Modern "Common Christological Declaration" (1994)

In recent history, the Roman Catholic Church has moved toward a reconciliation with the Assyrian Church of the East (often historically, though inaccurately, called the "Nestorian Church").

In 1994, Pope John Paul II and Mar Dinkha IV signed a Common Christological Declaration. In this document:

• The Catholic Church essentially agreed that the Assyrian Church’s use of the term "Mother of Christ" instead of "Mother of God" was not necessarily a denial of Christ’s divinity, but a matter of differing liturgical traditions.
• They agreed that both churches believe Christ is "perfect God and perfect man."

The Coptic Perspective

From the Coptic Orthodox perspective, we maintain the strict truth of the Council of Ephesus. We hold that anyone who divides Christ into two natures after the union—in a way that implies two distinct "entities" or "actors"—falls into the Nestorian error.

While the Roman Catholic Church claims its modern agreement with the Assyrian Church does not endorse the actual heresy of Nestorius, the Coptic Church remains cautious. We teach that the only way to safeguard against Nestorianism is to confess the Mia Physis—the One Nature of God the Word Incarnate—as established by the Great St. Cyril.

The Catholic Church officially condemns Nestorius as a heretic, but in modern ecumenical dialogue, it has accepted that the church historically labeled "Nestorian" actually holds an Orthodox faith in Christ under different terminology. The Coptic Church, however, remains the true guardian of the Cyrillian faith, ensuring that no language is used that could ever imply a division in our Lord, the Only-begotten Son.