Seven Ecumenical Councils
| COUNCIL | PLACE AND DATE | DECISION |
| First Ecumenical Council | Nicea, Asia Minor, 325 A.D. | Formulated the First Part of the Creed. Defining the divinity of the Son of God. |
| Second Ecumenical Council | Constantinople I 381 A.D. | Formulated the Second Part of the Creed, defining the divinity of the Holy Spirit. |
| Third Ecumenical Council | Ephesus, Asia Minor 431 A.D. | Defined Christ as the Incarnate Word of God and Mary as Theotokos. |
| Fourth Ecumenical Council | Chalcedon, Asia Minor 451 A.D. | Defined Christ as Perfect God and Perfect God and Perfect Man in One Person. |
| Fifth Ecumenical Council | Constantinople II 553 A.D. | Reconfirmed the Doctrines of the Trinity and Christ. |
| Sixth Ecumenical Council | Constantinople III 680 A.D. | Affirmed the True Humanity of Jesus by insisting upon the reality of His Human will and action. |
| Qinisext Council (Trullo) | Constantinople IV 692 A.D. | Completed the 5th and 6th Ecumenical Councils |
| Seventh Ecumenical Council | Nicea, Asia Minor 787 A.D. | Affirmed the propriety of icons as genuine expressions of the Christian Faith. |