When was the Doctrine of the Trinity defined?

[Lampo]

…and by whom?

 

[jburgherr]

…and by whom?

By Jesus Christ in AD 33

(Mat 28:19) Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit,…

 

[Lampo]

I didn’t ask the correct question, sorry. Did a pope infallibly define this Catholic Doctrine and if so, who and when? Thanks.

 

[quasimodo]

Look here

 

[tequilamac]

…and by whom?

I believe it was a strong tradition from the beginning. Then around 175 or 180 Ad Theophilus of Antioch was the first we know of to begin offical dialogues and definition. He defined the Trinity as
The Father, the Word and the Wisdom. Way before the actual official canon of the Bible. That is how strong belief in the Trinity has always been.

 

[Daniel_Marsh]

as I understand it, the church defined the doctrine of the trinity in 325 at a council which is in line with development of doctrine and was done in response to the arian countroversy. Many, things are true before they were defined. A statement from a council was needed to responed to the arian hersay.

Anotherwards, because it was defined in 325 does not mean that it was made up, or that it was not true before then.

 

[Br.Rich_SFO]

…and by whom?

It was defined as Doctrine at the Catholic Church Council of Nicaea and continued to be developed at Ephesus, Chalceden and The Fourth Lateran Council, Florence, even Vatican I addressed certain errors about the Trinity.

 

[Gottle_of_Geer]

…and by whom?

The First Council of Constaninople in 381 recognised the Divinity of the Holy Spirit as against the subordinationist ideas put forward by the Pneumatomachians & the followers of Macedonius; so that’s your answer, I think.​

The problem until then was normally that of how to combine belief in the Unity of God with the indications that God was not Uni-Personal: the positions eventually ruled heretical, were all attempts to combine the two truths that tended to sacrifice one of them to the other. By 431, when the next ecumenical council was held, at Ephesus, the questions had shifted from the Blessed Trinity to Christology. The Iconoclastic controversy in the 8th & 9th centuries was an offshoot of Christological questions.
Constantinople I was not originally recognised as a council of the whole Church - so Damasus of Rome (366-84) did not recognise it as ecumenical. Recognition throughout the Church took a few decades longer ##