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Or perhaps not until 380 AD

EDICT OF INTOLERANCE

379 The Emperor Theodosius. Gratian appointed a Spanish general named Theodosius to replace Valens as Emperor of the East (19 January). His parents were Nicenes, which is not surprising since Bishop Hosius had great influence in Spain. Theodosius led a successful campaign against the Visigoths, forced them to sue for peace, and proceeded to Thessalonica (a city in northeastern Greece) at the end of the year. There he became seriously ill, and believing he was about to die, he was baptized by the Nicene Bishop Ascholius. While he was recuperating from his illness, he was told that all the churches farther to the East, with the exception of Jerusalem, were in the hands of “Arians”. Upon hearing this, “Theodosius enacted a law at Thessalonica [27 February 380], which he caused to be published at Constantinople, well knowing that it would speedily become public to all the other cities, if issued from that city, which is as a citadel of the whole empire.” [Sozomen VII, ii & iv]
Edict of 380

It is our desire that all the various nation which are subject to our clemency and moderation should continue to the profession of that religion which was delivered to the Romans by the divine Apostle Peter, as it has been preserved by faithful tradition and which is now professed by the Pontiff Damasus and by Peter, Bishop of Alexandria, a man of apostolic holiness. According to the apostolic teaching and the doctrine of the Gospel, let us believe in the one deity of the Father, Son and Holy Spirit, in equal majesty and in a holy Trinity. We authorize the followers of this law to assume the title Catholic Christians; but as for the others, since in our judgment they are foolish madmen, we decree that they shall be branded with the ignominious name of heretics, and shall not presume to give their conventicles the name of churches. They will suffer in the first place the chastisement of divine condemnation, and second, the punishment that our authority, in accordance with the will of heaven, shall decide to inflict. [Theodosian Code XVI.1.2; and Sozomen, VII, iv]

As soon as I saw this edict, I realized it was one of the largest missing pieces, the first authoritative definition of Catholicism. Thus 27 February 380 is the birth date of the Catholic Church; despite all claims to the contrary, it did not exist prior to that time. Like the edict itself, church historians claim longevity for the Church retroactively, by pointing back to the Council of Nicea and the Apostle Peter.

By this edict, Theodosius reversed the policy of his predecessors, from tolerance to intolerance of religious diversity. The last sentence was a declaration of war that pre-justified religious persecution as the will of God. Here, then, is the original charter of the inquisitions, the crusades, and the burning of heretics all over Europe. The next time we see tolerance of religious diversity proclaimed as official state policy is 1300 years later, in Pennsylvania.

The Trinitarian formula imposed by the Edict of 380 is not the Nicene Creed of 325; it is the Athanasian Creed of 362. Thus, overnight, Theodosius made Athanasian heresy orthodox and the current orthodox faith “Arian” heresy.

the above excerpted from: History of the State Church of the Roman Empire at http://www.bswett.com/1998-05Church300.html