The First Council of Constantinople ("Constantinople I") was called by Emperor Theodosius in A.D. 381 to combat the Arian heresy, which had not ended after being condemned at the Council of Nicaea; and also to combat the heresy of the Macedonians, who denied the divinity of the Holy Spirit.
150 bishops attended. They reaffirmed and expanded the Nicene Creed to the version currently known, affirming the equal divinity of all three Persons of the Trinity.
They also wrote seven canons concerning church order. All seven are accepted by the Eastern Orthodox Church; only the first four are accepted by Roman Catholics.
At the conclusion of the council, Emperor Theodosius declared that all bishops must confess the equal divinity of all three Persons of the Trinity and be in communion with certain of the bishops who attended. The Creed of Nicaea-Constantinople in later centuries became the standard of Christian orthodoxy and Trinitarian profession. Saint Patrick the Apostle of Ireland famously used the shamrock in the fifth century to explain the doctrine of the Trinity declared at the Council of Nicea and this First Council of Constantinople in the fourth century.
Categories: [Councils]