Can't say for sure. Apostasy crept into the Church early though. By second or third century there were NEW traditions put in place. So around there. There are dubious letters that the RCC say support early establishment but the only agreed upon date is later. "In 321, Constantine instructed that Christians and non-Christians should be united in observing the venerable day of the sun, referring to the sun-worship that Aurelian had established as an official cult." This was the solidification of Roman dominance in Christian politics. There may have been jump starts before then but this was a major coup for the RCC as a force to be reckoned with.
Note I asked when it came into existence. You went off on a tangent about apostasy that was not part of the question. You also failed to cite a single source secular or otherwise.
If any of the other non-Catholics would care to attempt answer I would be most anxious to read your replies. Please note I am looking for a specific date and you need to cite a SECULAR source.
In those seven fine CATHOLIC CHURCHES in Asia?
I guess them early Catholics were not very good at catechizing their troops!
We KNOW that Peter was in error for a LONG time...
When Cephas came to Antioch, I opposed him to his face, because he stood condemned.
Galatians 2:11