October 2, 2026

• 10/2/2026

  The Great Schism of 1054 – the historical reasons for the split between the Orthodox and Roman Catholic Churches

• 10/2/2026

  The Fourth Council of Constantinople of 879–880 — the restoration of Patriarch Photius and the unity of the Church

• 10/2/2026

  The Eighth Ecumenical Council? The Council of Constantinople of 869–870 and the Church Unity Controversy, Patriarch Photius and Papal Authority

• 10/2/2026

  The Sixth Ecumenical Council of Constantinople (680–681): the condemnation of monothelitism and the affirmation of the two wills and the two actions in Jesus Christ

• 10/2/2026

  The Fifth Ecumenical Council of Constantinople (553): The Three Heads Controversy, Chalcedon’s Theological Legacy, and the Politics of Emperor Justinian I

• 10/2/2026

  The Fourth Ecumenical Council of Chalcedon (451): the Christological dispute and the formulation of the doctrine of the two natures of Jesus Christ

• 10/2/2026

  The Third Ecumenical Council of Ephesus (431): the Christological dispute between Cyril of Alexandria and Nestorius and the affirmation of the doctrine of the Mother of God

• 10/2/2026

  The second ecumenical council in Constantinople (381) – the confirmation of the doctrine of the Holy Spirit

• 10/2/2026

  The First Ecumenical Council in Nicaea (325) – the birth of the Nicene Creed

• 10/2/2026

  The Seventh Ecumenical Council (787) – the confirmation of the veneration of holy icons