Second Ecumenical Council: Constantinople I (381)

The council of a hundred and fifty bishops that met at Constantinople in 381 under Theodosius, after the Arian emperors were gone. St Gregory the Theologian presided for part of it and resigned during it. It confessed the divinity of the Holy Spirit against those who made Him a creature, and gave the Creed the form the Church says now: the Lord and Giver of life, who proceeds from the Father, who with the Father and the Son is worshipped and glorified, and the articles on the Church, baptism, the resurrection and the life of the age to come. Its third canon gave the bishop of Constantinople the first place after Rome, because it was the new Rome, which is the beginning of the order of the churches. It was a council of the East alone, and became ecumenical when Chalcedon received it.