4th Century...First Council of Constantinople (2nd Ecumenical Council - 381)

The First Council of Constantinople is recognised as the Second Ecumenical Council by the Assyrian Church of the East, the Oriental Orthodox, the Eastern Orthodox, the Roman Catholics, the Old Catholics, and a number of other Western Christian groups. This being the first Ecumenical Council held in Constantinople, it was called by Theodosius I in 381 which confirmed the Nicene Creed and dealt with other matters such as Arian controversy. The council took place in the church of Hagia Irene from May to July 381.

The Council of Nicaea did not end the Arian controversy which it had been called to clarify. By 327, Emperor Constantine I had begun to regret the decisions that had been made at the Nicene Council. He granted amnesty to the Arian leaders and exiled Athanasius because of Eusebius of Nicomedia. Even during numerous exiles, Athanasius continued to be a vigorous defender of Nicene Christianity against Arianism. Athanasius then famously said "Athanasius against the world". The Cappadocian Fathers also took up the torch; their Trinitarian discourse was influential in the council at Constantinople.

Up until about 360, theological debates mainly dealt with the Divinity of Jesus, the 2nd person of the Trinity. However, because the Council of Nicaea had not clarified the divinity of the Holy Spirit, the 3rd person of the Trinity, it became a topic of debate. The Macedonians denied the divinity of the Holy Spirit. This was also known as Pneumatomachianism.
source: Wikipedia

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