Church History · Interactive Games
The Seven Ecumenical Councils
Debate games and study guides for every Ecumenical Council — from Nicaea in 325 AD to Nicaea II in 787 AD. Step into the council hall, defend the faith against real historical heresies, and learn why each decision still shapes Christianity today.
Council Chronicles — Debate Games
325 AD
Council of Nicaea
Heresy: Arianism
“Is the Son truly God, or a created being?”
Play as: Bishop Alexander of Alexandria
381 AD
Council of Constantinople
Heresy: Neo-Arianism & Pneumatomachianism
“Is the Holy Spirit fully divine?”
Play as: Gregory of Nazianzus
431 AD
Council of Ephesus
Heresy: Nestorianism
“Is Mary rightly called Theotokos — Mother of God?”
Play as: Cyril of Alexandria
451 AD
Council of Chalcedon
Heresy: Monophysitism
“Does Christ have one nature or two?”
Play as: Pope Leo I
553 AD
Second Council of Constantinople
Heresy: Three Chapters Controversy
“Can the Church posthumously condemn heretical writings?”
Play as: Emperor Justinian's Bishops
680 AD
Third Council of Constantinople
Heresy: Monothelitism
“Did Christ have one will or two?”
Play as: Pope Agatho's Legates
787 AD
Second Council of Nicaea
Heresy: Iconoclasm
“Is the veneration of icons permissible?”
Play as: Patriarch Tarasios
Study the Councils
In-depth study pages covering background, theological controversy, key figures, and what each council decided — and why it still matters.
325 AD
First Council of Nicaea
Emperor Constantine I
Arianism — whether the Son of God is truly divine or the highest of created beings
381 AD
First Council of Constantinople
Emperor Theodosius I
The divinity of the Holy Spirit; Apollinarianism; completion of the Nicene Creed
431 AD
Council of Ephesus
Emperor Theodosius II
Whether Mary can be called Theotokos; the unity of Christ's person against Nestorianism
451 AD
Council of Chalcedon
Emperor Marcian and Empress Pulcheria
How Christ can be fully God and fully human; the errors of Eutyches and the legacy of Ephesus
553 AD
Second Council of Constantinople
Emperor Justinian I
The Three Chapters — posthumous condemnation of three Antiochene theologians to reassure Oriental Orthodox churches; Origenism
680–681 AD
Third Council of Constantinople
Emperor Constantine IV
Monothelitism — whether Christ has one will or two wills corresponding to his two natures
787 AD
Second Council of Nicaea
Empress Irene acting as regent for her son Emperor Constantine VI
Iconoclasm — whether Christian images of Christ, Mary, and saints may be venerated, or whether they are idolatry
What are the Ecumenical Councils?
Seven gatherings that defined Christianity
Ecumenical Councils are formal assemblies of bishops from across the Christian world convened to define doctrine, address heresies, and settle church discipline. The word ecumenical comes from the Greek oikoumene — the whole inhabited world — signalling that these councils speak for the whole Church, not just one region.
All seven councils are accepted by both the Catholic Church and the Eastern Orthodox Church. Most Protestant traditions accept at minimum the first four, which settled the doctrines of the Trinity and the person of Christ. Each council faced a specific heresy that would have fundamentally altered the faith — and defeated it.
Frequently Asked Questions
- Is the Council of Nicaea game free?
- Yes. All Council Chronicles games are completely free. No account required to play — just open the page and start debating.
- How historically accurate are the games?
- Each argument in the Nicaea game is drawn from real Arian sources: Arius's Thalia, his letters to Eusebius and Alexander, and the council proceedings. The responses reflect what Alexander, Athanasius, and other orthodox bishops actually argued.
- Which traditions accept all seven councils?
- The Catholic Church and the Eastern Orthodox Church accept all seven. Oriental Orthodox churches (Coptic, Ethiopian, Armenian, Syriac) accept the first three but not Chalcedon. Most Protestant traditions accept the first four councils on Trinitarian and Christological doctrine.
- When will the other council games launch?
- Constantinople I, Ephesus, and Chalcedon are in development. Sign up on the home page to be notified when each game launches.